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Old January 8, 2010, 11:58 AM
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Default Advice on shader overclock

Just started folding couple days ago, so please be patient... Got a second machine folding last night, both machines are running 9800 GTX+'s (stock clocks, stock cooling). Would like to know how far I can safely push the shaders and what sort of yields in PPD I will get. Is it worth upping the core and memory clocks as well? Specs of cards are as follows:

XFX 9800 GTX+ core 738 mem 1100 shader 1836
EVGA 9800 GTX+ core 778 mem 1123 shader 1836
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Old January 8, 2010, 11:59 AM
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You can typically get away with just bumping the memory shaders as the core doesn't add significantly enough ppd compared to the heat increase i've found
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Old January 8, 2010, 12:22 PM
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Try 1900 as a safe overclock and work up slowly from there. FurMark is a great testing tool to see if the cards are having any issues with heat, so I would run it at 1900 and look for artifacts on the screen that look like snow or blinking textures, and then every 25mhz or so for about a minute or two each time to ensure stability, otherwise you will get UNSTABLE_MACHINE during folding.. I have two: one at 1950 and one at 1990 both running 24/7 in the same case sandwiching a GTS 250.
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Old January 8, 2010, 12:54 PM
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Quote:
Originally Posted by boggtrotter59 View Post
Just started folding couple days ago, so please be patient... Got a second machine folding last night, both machines are running 9800 GTX+'s (stock clocks, stock cooling). Would like to know how far I can safely push the shaders and what sort of yields in PPD I will get. Is it worth upping the core and memory clocks as well? Specs of cards are as follows:

XFX 9800 GTX+ core 738 mem 1100 shader 1836
EVGA 9800 GTX+ core 778 mem 1123 shader 1836
Shaders do most of the work for Folding, OCing the mem will have some effect and the core almost nothing.

Shaders actually overclock in straps (steps) even though it isn't always shown by a monitoring program like GPU-Z. Your GTX+'s should have no problem getting to the 1944 MHz strap which runs between an indicated 1918->1971 MHZ. This means if you set your shaders to anywhere between 1918 and 1971 MHz they will actually run at 1944 MHz.

Here is a list of the shader steps put together by Mikecdm at Overclock.net from this thread; HOWTO: Overclock & Understand NVIDIA shader straps - Overclock.net - Overclocking.net

List of straps and where they fall in:

Green= Requested speed
Red= Actual speed

Most 8800, 9600, 9800, & GTX 2xx 65nm
1216-1269=1242
1270-1323=1296
1324-1377=1350
1378-1431=1404
1432-1485=1458
1486-1539=1512
1540-1593=1566
1594-1647=1620
1648-1701=1674
1702-1755=1728
1756-1809=1782
1810-1863=1836
1864-1917=1890
1918-1971=1944
1972-2025=1998
2026-2079=2052

GTX 2xx 55nm
1242-1271=1242
1272-1315=1296
1316-1342=1332
1343-1364=1350
1365-1385=1368
1386-1423=1404
1424-1451=1440
1452-1467=1458
1468-1494=1476
1495-1532=1512
1533-1559=1548
1560-1576=1566
1577-1603=1584
1604-1641=1620
1642-1668=1656
1669-1685=1674
1686-1712=1692
1713-1750=1728
1751-1772=1764
1773-1791=1782
1792-1817=1800
1818-1854=1836
1855-1880=1872
1881-1899=1890
1900-1925=1908
1926-????=1944
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Old January 8, 2010, 01:11 PM
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Yea I noticed that, setting the shaders with EVGA precision would only allow 1890 or 1944. I ran Furmark for about 10 min at 1890 (temps 82. fan 100%) no artifacting. When I bumped it up to 1944 it started artifacting within a couple minutes. This was on the EVGA card.
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Old January 8, 2010, 01:18 PM
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those shaders are quite high as they are. maybe a bios vgpu mod may get you more, not much tough. watch out for temps. what i do is i use precision, if it tells me if failed driver testing i back down till i can click it 3-4 times and no 'warning'
then run f@h and see if craps out. i feel its less risky than furmark or anything liek that, because when it craps out it just 'lets go' of the core. furmark you got to stop it yourself unless it freezes over.
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Old January 8, 2010, 01:22 PM
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Quote:
Originally Posted by boggtrotter59 View Post
Yea I noticed that, setting the shaders with EVGA precision would only allow 1890 or 1944. I ran Furmark for about 10 min at 1890 (temps 82. fan 100%) no artifacting. When I bumped it up to 1944 it started artifacting within a couple minutes. This was on the EVGA card.
Folding seems to heat up parts of the gpu not well ventilated by the stock fan. To get a high shader clock make sure you have lots of airflow over the card.
My bottom GTX+ will start to EUE if it gets over 62*s at the 1998 strap, the top card can get hotter with no effect.

If you feel the temps are high try downclocking the core, it might help.

Folding won't stress your card the way furmark will, you won't know if it will Fold at those clocks till you try...
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Old January 8, 2010, 01:26 PM
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I think I'll try folding at 1944 and see how that pans out.
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Old January 8, 2010, 01:39 PM
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Quote:
Originally Posted by LCB001 View Post
Folding seems to heat up parts of the gpu not well ventilated by the stock fan. To get a high shader clock make sure you have lots of airflow over the card.
My bottom GTX+ will start to EUE if it gets over 62*s at the 1998 strap, the top card can get hotter with no effect.

If you feel the temps are high try downclocking the core, it might help.

Folding won't stress your card the way furmark will, you won't know if it will Fold at those clocks till you try...
very true. taking the stock cooler off my gt's and adding a zalman or thermalright(no mem sinks) with a 120mm or two beating down on it does a much better job on all the components
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Old January 8, 2010, 01:57 PM
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Hooked up a 120 mm fan on both machines blowing over the cards, both seem to be folding fine at 1944. Should I run this overnight or more before I try the next bump? How soon do errors occur if you've pushed too far?
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