mods-vcore only as I cant find the vddr measurement points since they didnt run the caps through the board this time around. Dont exceed 1.8v without vapor cooling!!!!!!!
My card seems to be happiest around 1.76-1.77v
resistance used- 10k variable...done the same way as 9700pro...only difference is that the default vcore for the 9800 is 1.7v.
Cooling-swiftech mcw50-t 80 watt peltier with dedicated meanwell 320watt peltier power supply cooled by H2O rig consisting of mcp-300, swiftech dual 120mm radiator with dual 120mm y.s. tech 122.5cfm fans, acrylic bay resevoir.
DDR cooled by 4 sunon 80mm 50cfm intakes mounted on thermaltake ducting mods with dual 80mm sunon 50 cfm exhaust at the rear of the card. Aluminum heat sinks work better unless you have massive fans to cool the copper, otherwise the copper will absorb the heat and hold it there rather then dissapate the heat as quickly as copper. I notice better performance from chopping up an aeroflow heat sink and using the parts then when using the tweakmonster heat sinks....tweakmonsters look cool though.
Dont expect too much by way of gains though. Mine will oc on the core to about 505 before showing any artifacts.
The ddr on mine seems to crap out at about 400-405.
From what I can see the main gains over an overclocked 9700pro are that this bad boy is super stable. I have soldered in a voltage display from
http://www.datel.com to monitor the vcore and whereas the 9700pro bounces all over while benching and under load the 9800pro holds steady voltage with the occasional fluctuation of .o1v
good luck and let me know if you find a way to measure the vddr!
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xp2800+@2832mhz,radeon 9800pro256ddr2 @ 505/405