Overclocking is alive and well! PCSTATS has all the details you need to see at a glance to know how the various videocards tested perform relative to each other. The chart we've compiled below lists the highest overclocked core and memory clock speeds we were able to achieve while maintaining 100% stability. Results are grouped by GPU class, and ranked by highest memory overclock to lowest.

Maximum Videocard Overclocking Results
Videocards	Stock Memory	Stock Core	Overclocked Memory (MHz)	Overclocked Core (MHz)	Ranking (memory overclock)
High End Videocards
Diamond Viper Radeon HD 2900XT	2000	743	2246	825
MSI NX8800GTX-T2D768E-HD	1800	560	2132	665
Asus EN8800GTS/HTDP/320M	1600	500	2060	675
MSI NX8800GTS-T2D320E-HD-OC	1700	575	2020	662
Foxconn FV-N88SMCD2-ONOC	1800	575	2000	650
MSI NX7900GTX-T2D512E	1600	650	1772	702
Asus EAX1900XTX 2DHTV/512M/A	1550	650	1600	682
MSI NX7900GS-T2D512E-OC	1400	550	1612	675
MSI NX7900GT-VT2D256E-HD	1400	500	1527	575
Asus EN7900GT TOP/2DHT/256M/A	1440	520	1510	561
MSI NX7800GTX-VT2D512E	1700	550	1819	618
MSI NX7950GX2-T2D1GE	1200	500	1480	640
Asus EAX1950Pro/HTDP/256M/A	1400	560	1485	606
Gigabyte GV-NX78X256V-B	1200	430	1378	507
MSI NX7800GTX-VT2D256E	1200	430	1371	504
Albatron GeForce 7800GTX	1200	430	1347	479
Asus EN7800GT 2DHTV/256M/OSP/A	1000	400	1248	463
Asus EN7800GT TOP Silent/2DHTV/256M	1240	420	1240	566
MSI RX850XT-TD256E	1080	520	1215	852
MSI NX6800GT-T2D256E	1000	350	1160	416
MSI RX800XT-VTD256E	1000	500	1052	526
Mainstream Videocards
Foxconn 8600GTS-256	2016	675	2242	763
MSI NX8600GTS-T2D256E-OC	2000	700	2240	774
Albatron 8600GT-256	1400	540	1760	712
Biostar Sigma-Gate GeForce 7600GS*	1400	400	1752	680
MSI NX8600GT-T2D256E-OC	1600	580	1730	708
Gigabyte NX76T256D-RH Silent	1400	560	1612	628
Asus EN7600GT Silent/2DHT/256M/A	1400	560	1596	635
MSI NX7600GT-VT2D256E	1400	540	1568	626
Asus EAX1600XT Silent/TVD/256M/A	1396	587	1530	691
PowerColor X1600XT Bravo	1396	587	1396	631
Asus EN6600GT/Silencer/HTD/256M/A	1040	520	1149	566
MSI NX6600GT-TD128E	1000	500	1130	563
ATi Radeon X800 XL	984	398	1113	441
Gigabyte GV-RX18L256V-B	990	500	1080	521
Gigabyte GV-NX66T128D	1000	500	1070	583
MSI RX800XL-VT2D256E	984	398	1068	421
PowerColor X700 Pro	864	425	1040	483
Asus Extreme N6600TOP/TD/128M/A	900	400	1030	623
Gigabyte GV-RX800L256V	984	398	1026	421
Gigabyte GV-RX70P256V	864	420	904	491
Gigabyte GV-NX66T256DE	824	515	875	617
MSI NX6800 TD-128E	600	325	827	454
Entry Level Videocards
MSI NX8500GT-TD256E	800	450	1040	676
PowerColor X800GTO	702	398	756	438
Albatron GeForce 6600 512	500	300	550	490
PowerColor X700	532	398	532	461
Albatron PC6600LEQ	400	300	507	437
Ranked according to maximum overclocking memory result. Coming up with a criteria to rank the videocards was very difficult but we ended up ranking maximum memory speed. Memory bandwidth plays a key role in the overall performance of the videocard and realistically a GPU/VPU can never get enough no matter how it is designed. * The Biostar Sigma-Gate GeForce 7600GS has core and memory voltage options. If you're new to Overclocking and not sure what to do, check out these two excellent Guides for some pointers:Overclocking the CPU and Memory, Overclocking the Videocard

The Diamond Viper Radeon HD 2900XT is definitely one fast videocard. As you can see here, Diamonds' videocard sits at the top of the high end overclocking charts thanks to that very nice memory overclock of 825MHz PCSTATS achieved.