DVI-I Computer Graphics Cards for Sale

MSI Radeon HD 6950 Twin Frozr III PE/OC Graphics Card, PCIe x16 2.1, 2GB GDDR5
Pre-Owned · MSI
$35.99
Was: $39.99was - US $39.99
$6.93 shipping
9+^P & * D]L wT.?G! 1L |K/C $S p o n s o r e d
LOT OF 11: RADEON ATI-102-C33402 (B) HD 7570 1GB GDDR5 DVI DP LOW PROFILE GPU
Pre-Owned · AMD
$84.74
Free shipping
9+N^ &* G]0 w. ?!LH| / $61S p o n s o r e d
ASUS Nvidia GeForce GTX 750 2GB GDDR5 Graphics Card
Pre-Owned · ASUS
$29.99
Was: $39.99was - US $39.99
or Best Offer
$9.24 shipping
Est. delivery Wed, Apr 30
+E^ Z&* ] VX w.?!| / $SU HS p o n s o r e d
LOT OF 25: NVIDIA QUADRO FX 580 512MB GDDR3 VIDEO GRAPHICS CARD DVI DisplayPort
Pre-Owned · Dell
$198.95
or Best Offer
$18.95 shipping
+^M A&* MB ] 9w.?E!|/ $YI S p o n s o r e d
Dell AMD Radeon R5 340X 2GB GDDR3 Graphics Card Low Profile - DisplayPort - DVI
Very Good - Refurbished · Dell
(10)
$9.79
or Best Offer
Free shipping
237 sold
eBay Refurbished
G+F G^R &* LJ 38] w 1.?!0 |/ $
New ListingDell Radeon R7 450 4GB GDDR5 SFF 2x DisplayPort Graphics Card TDMFC Low Profile
Pre-Owned · Dell
(13)
$27.50
or Best Offer
Trending at $31.33
Free shipping
Only 1 left!
0E +^ &IY* ND L4 ] w.?!|/BL $
AMD Radeon R7 350X 4GB DDR3 High Profile Graphics Card - DisplayPort - DVI
Very Good - Refurbished · AMD
$24.99
or Best Offer
Free shipping
722 sold
eBay Refurbished
G5+ 0W P^O &* R J] w .?2R !|/ $
NVIDIA GeForce GTX TITAN XP Star Wars Empire Collector's Edition 12GB GDDR5X GPU
Good - Refurbished · NVIDIA
$234.99
Free shipping
286 watching
eBay Refurbished
U6 +^CK &*7J ] EX 5W w .?!|/ $
Sapphire ATI Radeon HD 3850, 512MB GDDR3 DUAL DVI-I/TVO, AGP Graphics Card.
Pre-Owned · SAPPHIRE
$195.00
$16.65 shipping
5+2^ L &* ] U 4w.?!R |/ $B1
Dell AMD Radeon R7 450 4GB DDR5 2 x DisplayPort Low Profile Graphics Card TDMFC
Pre-Owned · Dell
(13)
$34.97
or Best Offer
Free shipping
+^ &*E H 6V] V 2 KM Aw.Y ?!|/ $
Dell AMD FirePro W5100 4 GB GDDR5 PCIE DisplayPort Full Height Video Card W2C47
Pre-Owned · Dell
(2)
$20.00
Trending at $26.95
$7.95 shipping
6 watching
+I^O &* ] w.3U ?UG! |O/L $
New ListingGIGABYTE GEFORCE GTX 750 TI 2GB GDDR5 GRAPHICS CARD GV-N75TOC-2GL LOW PROFILE
Pre-Owned · GIGABYTE
(13)
$40.00
Trending at $44.99
$7.36 shipping
+X7 23^ X&*6 D] Xw .Q?!|I / $
MSI Nvidia N680GTX Twin Frozr iii 4GD5/OC GPU video card PCI Express HDMI
Pre-Owned · MSI
$44.00
Free shipping
7D+^ & *D7 ] w.? !|2/4 $Z
Gaming PC
Parts Only
$400.00
or Best Offer
$13.43 shipping
+B^T &O* H] 0I w.?Q0! 1|/Y $S p o n s o r e d
Toxic AMD Radeon R9 270X 2GB 256 bit GDDR5 PCI-E 3.0 w/ BOOST GPU Graphics Card
Open Box
$99.99
Free shipping
2Y +^C &N* 9]P H w.?K!|/ $S p o n s o r e d
Nvidia GeForce GTX 295 1792MB GDDR3 Graphics Card (900-10656-0000-100)
Pre-Owned · Nvida
$195.00
Free shipping
Only 1 left!
B+E ^ D3& * ] wK4 .0?H! ZV| / $S p o n s o r e d
Nvidia GeForce GTX 1080 8GB GDDR5X PCIe Graphics Card Dell P/N: 0H7FC2
Pre-Owned · Graphics
$94.00
$13.95 shipping
+^ &* ]0 wP.?! |E/B GG $
HP Nvidia Quadro K5200 8GB GDDR5 Graphics Video Card GPU
Pre-Owned · HP
(1)
$64.99
or Best Offer
Free shipping
15 sold
+D^ K& *P 9] Ww.7?! 1|/Z 1I $
HP Nvidia Quadro M6000 12GB GDDR5 384-bit Video Graphics Card Short Span Bracket
Pre-Owned · HP
$139.00
Free shipping
+^ &4*1 ] 1w5. 9V? !|/7 $Z
Dell AMD Radeon HD 7570 1GB GDDR5 DVI DP LOW PROFILE Video Card KFWWP
Pre-Owned · AMD
(2)
$9.95
Free shipping
Only 3 left
+A^ H&* ] BH w.? !R|R / $C
SAPPHIRE Radeon NITRO+ RX 570 8GB GDDR5 PCI-Express Graphics Card
Pre-Owned · SAPPHIRE
(19)
$50.00
or Best Offer
$19.00 shipping
+^ 27 G&*C ] wUI .EX? !7|6 / $
ATI Radeon 9800 Pro 128MB AGP8X Video Graphics Card - Tested
Pre-Owned · ATI
$89.95
or Best Offer
$13.20 shipping
+^ &6O* 0I] wQ.9? !FL |/ $
ATI AIW All-in-Wonder X800XT 256MB AGP 8x Graphics Video Card Open Box Unused
Open Box · ATI Technologies
$274.95
$13.45 shipping
+^ &* ]CQ w.?4G!|/ $KL Y
AMD Radeon HD 8490 109-C55357-00_02 C553 Video Card PCIe 1GB DVI DisplayPort
Pre-Owned · AMD
(2)
$7.86
or Best Offer
Free shipping
Only 2 left
Q+N^ &* ]G w.?V K!G|/ H $B
New ListingGIGABYTE GeForce GTX 1080 8GB GDDR5X Turbo OC Graphics Card (GVN1080TTOC8GD)
Pre-Owned · GIGABYTE
(12)
$100.00
or Best Offer
$9.39 shipping
A+Z^ & 3* 4] 8 Rw.? 2!|J / D$
NVIDIA EVGA GeForce GTX TITAN X 12GB 12G-P4-2992-KR Graphics Video Card T12-F5
Pre-Owned · Titan
(1)
$162.00
Was: $180.00was - US $180.00
or Best Offer
$10.00 shipping
W+^ R &*UM ] BL w.C?!V |P/ $
ASUS Geforce GTX 1050 2GB PH-GTX1050-2G Graphics Gaming Video Card
Pre-Owned · ASUS
(3)
$49.95
or Best Offer
Free shipping
+^7 Q& PK * E]6 A wY. ?!|B/0 $
AMD Radeon R5 340X 2GB GDDR3 PCIe Graphics Card FULL Profile✅ DVI DP ✅Dell Y7XRF
Pre-Owned · Dell
(1)
$9.95
Free shipping
Only 1 left!
A5 Y+^I &* I] Ew DU .?!Y|B/ $
DELL 01MPR3 AMD Radeon R9 360 Graphics Card 2GB GDDR5 TESTED!
Pre-Owned · Dell
$29.99
or Best Offer
Free shipping
2 watching
SQ +O^ &* Z ] w.?V!Q |/ G$S p o n s o r e d
ATI RADEON HD 5770 1GB VIDEO CARD - Mac Pro A1186 2008, A1289 2009 2010 2012
Pre-Owned · ATI
(3)
$21.88
Free shipping
24 watching
+^YL A &* ]Y wT.6 ?!9|/ W$S p o n s o r e d
NVIDEA M5000 Quaddro Graphics Video Card
Open Box · Nvdia
$85.00
or Best Offer
$16.65 shipping
+C^D 4&* ]M I w6 64.? 2!|E/ $S p o n s o r e d
EVGA GeForce GTX 780 3GB
Pre-Owned · EVGA
$76.00
Was: $80.00was - US $80.00
$8.00 shipping
2 watching
NP+^ &*N ]4 w.? !UD|/ S$LS p o n s o r e d
Zotac Nvidia GeForce GT520 512MB 64Bit DDR3, PCI Graphics Card. (ZT-50610-10L)
Pre-Owned · ZOTAC
$100.00
$9.45 shipping
N+^ O&* ] w.? !55 OD 91|/ V$
Dell HD 8570 AMD Video Card Low Profile YT0RH 0YT0RH
Pre-Owned · Dell
(17)
$3.00
or Best Offer
$6.20 shipping
13 watching
+^J T& * R] I w4.E?!| I2 / $
AMD Radeon HD 8570 1GB DDR3 8HW0R 08HW0R Full Height/size DP & DVI Video Card
Pre-Owned · AMD
(3)
$9.95
Trending at $11.19
Free shipping
+S3 ^EP &76 4*N ] w.?!|/ $
EVGA Nvidia GeForce GTX 980 Ti 6GB Video Graphics Card 06G-P4-4995-BR *NO BOX*
Open Box · EVGA
(79)
$99.99
Free shipping
Only 2 left
+^ B&* G] 9 wS .L?!|T/ $ W
AMD Radeon R5 340X 2GB DVI & DisplayPort Full height card Dell 0Y7XRF
Pre-Owned · Dell
(3)
$11.95
Free shipping
178 sold
+^ &Z*U FY] w B.?R! J|/A 6 $
HP Nvidia Quadro M6000 12GB GDDR5 384-bit Video Graphics Card 4x DP 803271-001
Pre-Owned · HP
$159.99
Free shipping
36 watching
D+I ^ &ZK* ] 26w.? !|/ M1$
PNY NVIDIA Quadro K2200 4GB 128-bit Workstation GDDR5 Video Graphics
Pre-Owned · PNY
$130.50
or Best Offer
$18.95 shipping
+^ &*F 3 1]Z 6Z w .FX ?4!|/ $S p o n s o r e d
OPEN BOX✔️ AMD X-1650 Windows XP DVI (2) VIDEO GRAPHICS CARD ✔️RARE
Open Box · ATI
$67.46
Was: $104.95was - US $104.95
or Best Offer
Free shipping
+W2^ &*E3 3U ] wGK.? !|3U / $S p o n s o r e d
Dell Nvidia Quadro K620 Low Profile 0JGN28 JGN28 Video Card
Pre-Owned · Dell
(5)
$13.49
or Best Offer
Trending at $14.97
$5.95 shipping
+^Z 0&* ] w8.?!E|/ $ B
Nvidia Quadro 400 180-11052-1005-A00 PCI-e Graphics Video Card DisplayPort DVI
Pre-Owned · NVIDIA
$8.38
or Best Offer
Free shipping
6 watching
K+M^ &TO* ] Xw0 .?!|R/ $
GeFORCE 6800 GT OC Graphics Card AGP 256MB GDDR3 BFG Tech nVIDIA in box
Open Box · BFG Tech
$200.00
or Best Offer
$9.88 shipping
7+H M^ &* ] wO .?C!|M/ 6U $
Dell AMD Radeon R5 340X 2GB GDDR3 Desktop Video Graphics Card GPU | 0KG8WY |
Pre-Owned · Dell
(7)
$11.85
or Best Offer
Free shipping
Only 1 left!
+^7 &L* ] w 1L. 6X?!|/ $ SR
Lot of 2 Dell Nvidia Quadro K4000 3GB GDDR5 Graphic Card 0D5R4G
Pre-Owned · Dell
$39.99
Free shipping
+K^ 6&* 77 C]X w.? !|/ $UO
DELL OPTIPLEX 780 790 960 980 990 3040 3050 7010 7020 7040 7050 SFF Video Card
Pre-Owned · Dell
(65)
$12.95
Free shipping
113 sold
Z+^ &1* 4 ]B 3 w.I? G!G B|2/ $
BFG Nvidia GeForce 7800 GS OC, 256MB GDDR3, AGP Graphics Card. (BFGR78256GSOC)
Pre-Owned · BFG
$180.00
$16.65 shipping
+^ T&5* ] 0wY.?!|/ 5W $G
Dell 0YT0RH Radeon HD 8570 1GB DDR3 PCIe DVI DP Graphics Card Low Profile GPU
Pre-Owned · Dell
(9)
$9.95
Free shipping
39 watching
U+^ H& * ] w0.J ?!V1|/ I $E
Sapphire Pulse RX580 8GB PCI-Mac Pro Compatible Metal Video Card OSX macOS
Pre-Owned · SAPPHIRE
$139.99
Free shipping
Only 1 left!
WY +^F2 & *G ] w.2?! G3|/ $
Dell nVidia GeForce GTX 770 2GB GDDR5 Graphics Card 2x DVI HDMI DP, 0CRVMW
Pre-Owned · NVIDIA
(2)
$34.95
Free shipping
6 watching
Z+6^ T&* ] wH 9.?M !|/ $8Z
ZOTAC ZT-P10710B-10P GeForce GTX 1070 Ti AMP Extreme Graphics Card
Brand New · ZOTAC
$199.99
or Best Offer
Free shipping
X+^ 4&* SW 9M Q6 ] JIw.?! |/ $
NVIDIA GeForce GTX 550 TI 1GB DDR5 PCI Express Dual DVI Mini HDMI Graphics Card
Pre-Owned · NVIDIA
$20.00
or Best Offer
$8.71 shipping
7+^ &O* ] w IX.?! C|4/ N1$
EVGA GEFORCE GTX 980 4GB GDDR5 04G-P4-1980-KR GRAPHICS CARD NS-P7D
Pre-Owned · EVGA
$50.00
or Best Offer
$9.45 shipping
6 watching
RS+^ W Q &* 0B K] Ew .?S!H|/ $
New ListingGIGABYTE GeForce GTX 980 Ti 6GB GDDR5 Graphics Card (GV-N98TG1) Clean
Pre-Owned · GIGABYTE
(18)
$85.00
or Best Offer
$16.00 shipping
7I +^X4 & * ] w.?!|/DH 4$
Genuine MSI AMD Radeon R7 250 2GB DDR5 High Profile Bracket GPU P/N: MS-V301
Excellent - Refurbished · MSI
$29.99
Was: $36.00was - US $36.00
Free shipping
eBay Refurbished
RY+^ &* ] AwG .?NA !|NK/ P$
Zotac NVIDIA GeForce GTX 970 4GB GDDR5 Video GPU Graphics Card
Pre-Owned · ZOTAC
(3)
$45.00
Free shipping
+F5 ^5 4&* ] w.?!9|K/ $
ATI RADEON HD 5770 1GB VIDEO CARD - Mac Pro A1186 2008, A1289 2009 2010 2012
Pre-Owned · ATI
$24.00
or Best Offer
Free shipping
6 watching
+P9 ^ &3L *9 ]R Jw.?!|/ B $
SAPPHIRE NITRO+ RX 580 8G G5 8GB GDDR5 Graphics Card (11265-01-20G)
Pre-Owned · SAPPHIRE
(118)
$68.00
or Best Offer
Trending at $70.00
$12.52 shipping
+^1 &*9 PV ] w.?O7 !A|/ H$
SAPPHIRE Radeon RX 580 4GB GDDR5 Graphics Card (11265-10)
Pre-Owned · SAPPHIRE
$65.00
or Best Offer
$10.67 shipping
+EJ^ &L* ]Z w.?!|L/2 $SG S p o n s o r e d
GIGABYTE Video Card PCI-E Display port Dual HDMI/DVI GV-N75TOC-2GL Rev 1.0
Pre-Owned · GIGABYTE
(13)
$28.00
Was: $40.00was - US $40.00
or Best Offer
$22.70 shipping
Only 1 left!
I+^X R &* U] w. ?!1|3/ $ 4S p o n s o r e d

DVI-I Computer Graphics Cards

Shop by Category

7,388 Results

MSI Radeon HD 6950 Twin Frozr III PE/OC Graphics Card, PCIe x16 2.1, 2GB GDDR5

LOT OF 11: RADEON ATI-102-C33402 (B) HD 7570 1GB GDDR5 DVI DP LOW PROFILE GPU

ASUS Nvidia GeForce GTX 750 2GB GDDR5 Graphics Card

LOT OF 25: NVIDIA QUADRO FX 580 512MB GDDR3 VIDEO GRAPHICS CARD DVI DisplayPort

Dell AMD Radeon R5 340X 2GB GDDR3 Graphics Card Low Profile - DisplayPort - DVI

New ListingDell Radeon R7 450 4GB GDDR5 SFF 2x DisplayPort Graphics Card TDMFC Low Profile

AMD Radeon R7 350X 4GB DDR3 High Profile Graphics Card - DisplayPort - DVI

NVIDIA GeForce GTX TITAN XP Star Wars Empire Collector's Edition 12GB GDDR5X GPU

Sapphire ATI Radeon HD 3850, 512MB GDDR3 DUAL DVI-I/TVO, AGP Graphics Card.

Dell AMD Radeon R7 450 4GB DDR5 2 x DisplayPort Low Profile Graphics Card TDMFC

Dell AMD FirePro W5100 4 GB GDDR5 PCIE DisplayPort Full Height Video Card W2C47

New ListingGIGABYTE GEFORCE GTX 750 TI 2GB GDDR5 GRAPHICS CARD GV-N75TOC-2GL LOW PROFILE

MSI Nvidia N680GTX Twin Frozr iii 4GD5/OC GPU video card PCI Express HDMI

Gaming PC

Toxic AMD Radeon R9 270X 2GB 256 bit GDDR5 PCI-E 3.0 w/ BOOST GPU Graphics Card

Nvidia GeForce GTX 295 1792MB GDDR3 Graphics Card (900-10656-0000-100)

Nvidia GeForce GTX 1080 8GB GDDR5X PCIe Graphics Card Dell P/N: 0H7FC2

HP Nvidia Quadro K5200 8GB GDDR5 Graphics Video Card GPU

HP Nvidia Quadro M6000 12GB GDDR5 384-bit Video Graphics Card Short Span Bracket

Dell AMD Radeon HD 7570 1GB GDDR5 DVI DP LOW PROFILE Video Card KFWWP

SAPPHIRE Radeon NITRO+ RX 570 8GB GDDR5 PCI-Express Graphics Card

ATI Radeon 9800 Pro 128MB AGP8X Video Graphics Card - Tested

ATI AIW All-in-Wonder X800XT 256MB AGP 8x Graphics Video Card Open Box Unused

AMD Radeon HD 8490 109-C55357-00_02 C553 Video Card PCIe 1GB DVI DisplayPort

New ListingGIGABYTE GeForce GTX 1080 8GB GDDR5X Turbo OC Graphics Card (GVN1080TTOC8GD)

NVIDIA EVGA GeForce GTX TITAN X 12GB 12G-P4-2992-KR Graphics Video Card T12-F5

ASUS Geforce GTX 1050 2GB PH-GTX1050-2G Graphics Gaming Video Card

AMD Radeon R5 340X 2GB GDDR3 PCIe Graphics Card FULL Profile✅ DVI DP ✅Dell Y7XRF

DELL 01MPR3 AMD Radeon R9 360 Graphics Card 2GB GDDR5 TESTED!

ATI RADEON HD 5770 1GB VIDEO CARD - Mac Pro A1186 2008, A1289 2009 2010 2012

NVIDEA M5000 Quaddro Graphics Video Card

EVGA GeForce GTX 780 3GB

Zotac Nvidia GeForce GT520 512MB 64Bit DDR3, PCI Graphics Card. (ZT-50610-10L)

Dell HD 8570 AMD Video Card Low Profile YT0RH 0YT0RH

AMD Radeon HD 8570 1GB DDR3 8HW0R 08HW0R Full Height/size DP & DVI Video Card

EVGA Nvidia GeForce GTX 980 Ti 6GB Video Graphics Card 06G-P4-4995-BR *NO BOX*

AMD Radeon R5 340X 2GB DVI & DisplayPort Full height card Dell 0Y7XRF

HP Nvidia Quadro M6000 12GB GDDR5 384-bit Video Graphics Card 4x DP 803271-001

PNY NVIDIA Quadro K2200 4GB 128-bit Workstation GDDR5 Video Graphics

OPEN BOX✔️ AMD X-1650 Windows XP DVI (2) VIDEO GRAPHICS CARD ✔️RARE

Dell Nvidia Quadro K620 Low Profile 0JGN28 JGN28 Video Card

Nvidia Quadro 400 180-11052-1005-A00 PCI-e Graphics Video Card DisplayPort DVI

GeFORCE 6800 GT OC Graphics Card AGP 256MB GDDR3 BFG Tech nVIDIA in box

Dell AMD Radeon R5 340X 2GB GDDR3 Desktop Video Graphics Card GPU | 0KG8WY |

Lot of 2 Dell Nvidia Quadro K4000 3GB GDDR5 Graphic Card 0D5R4G

DELL OPTIPLEX 780 790 960 980 990 3040 3050 7010 7020 7040 7050 SFF Video Card

BFG Nvidia GeForce 7800 GS OC, 256MB GDDR3, AGP Graphics Card. (BFGR78256GSOC)

Dell 0YT0RH Radeon HD 8570 1GB DDR3 PCIe DVI DP Graphics Card Low Profile GPU

Sapphire Pulse RX580 8GB PCI-Mac Pro Compatible Metal Video Card OSX macOS

Dell nVidia GeForce GTX 770 2GB GDDR5 Graphics Card 2x DVI HDMI DP, 0CRVMW

ZOTAC ZT-P10710B-10P GeForce GTX 1070 Ti AMP Extreme Graphics Card

NVIDIA GeForce GTX 550 TI 1GB DDR5 PCI Express Dual DVI Mini HDMI Graphics Card

EVGA GEFORCE GTX 980 4GB GDDR5 04G-P4-1980-KR GRAPHICS CARD NS-P7D

New ListingGIGABYTE GeForce GTX 980 Ti 6GB GDDR5 Graphics Card (GV-N98TG1) Clean

Genuine MSI AMD Radeon R7 250 2GB DDR5 High Profile Bracket GPU P/N: MS-V301

Zotac NVIDIA GeForce GTX 970 4GB GDDR5 Video GPU Graphics Card

ATI RADEON HD 5770 1GB VIDEO CARD - Mac Pro A1186 2008, A1289 2009 2010 2012

SAPPHIRE NITRO+ RX 580 8G G5 8GB GDDR5 Graphics Card (11265-01-20G)

SAPPHIRE Radeon RX 580 4GB GDDR5 Graphics Card (11265-10)

GIGABYTE Video Card PCI-E Display port Dual HDMI/DVI GV-N75TOC-2GL Rev 1.0

Best Selling

EVGA NVIDIA GeForce 6200 (512P1N402LR) 512MB DDR2 SDRAM PCI Video Card

VisionTek AMD Radeon HD 5450 2GB DDR3 Graphics Card (900861)

612952-003 Ws094at HP NVIDIA QUADRO 2000 1gb Graphics Card

GIGABYTE Gv-n710d5-2gil Graphics Card NVIDIA GeForce GT 710 2 GB Gddr5

HP GeForce GTX 1060 3GB GDDR5 Graphics Card (909616001)

EVGA GeForce GT 710 1GB DDR3 Graphic Card

SAPPHIRE NITRO+ RX 580 8G G5 8GB GDDR5 Graphics Card (11265-01-20G)

GIGABYTE GeForce GT 710 2GB DDR5 Graphics Card (GVN710D52GL)

Top Rated

EVGA NVIDIA GeForce GT 730 (02G-P3-3733-KR) GDDR5 SDRAM Graphic Card

SAPPHIRE AMD Radeon RX 580 8GB GDDR5 Graphics Card (100411NT+8GSEL)

SAPPHIRE NITRO+ RX 580 8G G5 8GB GDDR5 Graphics Card (11265-01-20G)

VisionTek AMD Radeon HD 5450 2GB DDR3 Graphics Card (900861)

EVGA NVIDIA GeForce 6200 (512P1N402LR) 512MB DDR2 SDRAM PCI Video Card

Dell AMD Radeon R7 450 4GB GDDR5 Graphics Card (0TDMFC)

AMD Radeon HD 6450 1gb Ati-102-c26405 Video Card HDMI Cable DVI Adapter 0g742v

EVGA Nvidia GeForce GTX 980 Ti 6GB Video Graphics Card 06G-P4-4995-BR NO BOX