How do the new 8800GTS 320MB's Overclock?

[Jules]

Originally posted by: SickBeast

Originally posted by: CaiNaM
i see a few of these #'s in this thread, but the GTS core doesn't run at 620, 630, or 660Mhz.

if you set the clock frequency anywhere from 618Mhz to 634Mhz, the core runs at 621Mhz & 1458Mhz shader.

from 635-641 it's 648Mhz core, 1458Mhz shader.

from 642-661 it's 648Mhz core, 1512Mhz shader.

that's why some ppl will find it runs perfectly stable when set to 634, but artifacts & crashes at 635 (because in reality it's jumping from 621 to 648Mhz). in fact, i'd bet zizo who stated his was running @ 660 would have major issues @ 662 (cause @660 the core is actually running 648Mhz, and @ 662 it would try to jump all the way to 675Mhz).

the core increments i know are 594, 612, 621, 648, 675, 684. there's a chart floating around somewhere which shows set frequency and actual frequency from around 500Mhz to 759Mhz, but i don't recall off the top of my head..

That's interesting. My card actually crashed when I had it set at 625/1000, so I've backed it down to 615/980 and it's fine so far. Is it really running at 615? Does the core run at a certain increment?

No its running at 612 core.

 

[CaiNaM]

Originally posted by: SickBeast
That's interesting. My card actually crashed when I had it set at 625/1000, so I've backed it down to 615/980 and it's fine so far. Is it really running at 615? Does the core run at a certain increment?

ues. you're running at 612 core, 1404 shader. i found the acutal chart so you can take a look at it: http://www.cet.com/~maniac/pix/g80_clock_chart.jpg

on another note, i'm not sure on vista drivers, but on xp drivers since 97.92, the memory doesn't overclock if you're running dual monitor mode. it will allow you to change it, but it will run default clocks. took me awhile to figure out, but it's due to the driver somehow; single monitor works fine. that's why i did the bios change, which ended up good anyway as my settings work regardless of OS.

edit: oh.. and to the OP: my 320mem didn't overclock quite as well as my 640 (the core was about the same). 1800mhz compared to 2000+ on the 640mb.

 

[Matt2]

Clock domains FTW!

Good info CaiNaM. You brought the house down!

 

[CloE]

these card have high temp. 74C? anyone tried watercooling on them to get higher OC?