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Sli Clock Rates


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#1 Eric K

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Posted 09 December 2007 - 10:22 PM

I am thinking of purchasing a second GPU for sli config. My GPU (XFXPVT71JYHE9) seems to have been replaced by a newer version (XFXPVT71JYPF4). Both cards are very similar being in the 7950 GT line. The previous being passively cooled and the latter fan cooled. The only other differences are the clock rate and the memory clock. (570 MHZ Clock Rate, 1.46 GHZ Memory Clock for the YHE9 and 550 MHZ Clock Rate, 1.4 GHZ Memory Clock for the YPF4) It is my understanding that the clock rates must be exactly the same for the SLI configuration to display properly. Am I wrong in this assumption?

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#2 DaChew

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Posted 10 December 2007 - 12:24 AM

http://hardocp.com/article.html?art=ODY5

older article says they don't have to be exactly matched but

Note: You must still use two graphics cards that have the same GPU model. For example, a GeForce 7800 GT must be matched with another GeForce 7800 GT (not with a GeForce 7800 GTX or a GeForce 6800 Ultra).


Edited by DaChew, 10 December 2007 - 12:25 AM.

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#3 roon

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Posted 10 December 2007 - 04:22 AM

u can use the rivatuner or any other GPU overclock utility to match their clock rates.
AMD Athlon X2 4200+ Processor@2.2Ghz per core, Asus M2N-E mobo, 1GBx2 PC-5300 DDRII RAM, 80 GB Seagate SATA drive 7200 RPM (ST380817AS), Nvidia nforce570 mcp chipset, XFX nvidia Geforce 8400GS 256MB(64 bit) 512MB-TC Graphics card, Bridge BM 17c monitor.

#4 Eric K

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Posted 10 December 2007 - 09:29 PM

Thanks for the reply. This was my first build so I am new to everything including overclocking. I looked at the NVIDIA contol panel from my mobo and it seems fairly simple to match the clock frequencies. There are settings for manual or automatic adjustments. Looks like my GPU is no longer available with 512 MB memory only 256. Unless I purchase the fan cooled unit I mentioned and use the NVIDIA auto overclocking. My sytem consists of: Black Cooler Master Praetorian case, EVGA 122-CK-NF68-AR LGA 775 NVIDIA nForce 680i SLI ATX Intel Mobo, Intel Core 2 Duo E6400 Conroe 2.13GHZ processor, Thermaltake W0131RU ATX12V/EPS 12V 850W power supply, XFX PVT71JYHE9 GeForce7950 GT 512 MB 256 Bit GDDR3 PCI E 16 SLI GPU, Corsair XMS2 Dominator 2GB DDR2 800 (PC2 6400) Dual Channel memory with fans, Seagate Barracuda 7200.10 500 GB SATA Hard Drive, Maxtor 200 GB External Hard Drive, Arctic Cooling Freezer 7 Pro 92 mm CPU Cooler, Plextor PX-755SA SATA DVD Burner, Asus SATA DVD Rom E616A3T, Thermaltake A2349 Intelligent Fan Control, Lian Li Fan Controller, SIIG JU-91RW12-S4 9 in 1 USB 2.0 Card Reader/Write + Floppy, Thermaltake A2331 Media Lab, Thermaltake A2376 Aluminum HDD Cooling Fan, Cooler Master SAF-S83-E1 80 mm Case fans, Logitech MX Revolution mouse, Viewsonic X Series VX2245wm Black-Silver 22" Widescreen monitor, Logitech Quickcam Ultra Vision SE webcam, Razor Tarantula RZ03-0007 keyboard. The Operating System Is Microsoft Windows XP MCE.




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