There are some weird things going on when I try to overclock my SLI rig. I have two very different eVGA 7800GTs. Both have different stock clocks and both have different OCing headroom. Look and see what I mean:
eVGA 7800GT - last4 of model: N518
stock: 445/1070 - OC Max: 510/1200
eVGA 7800GT CO ?SE? ? last4 of model: N516
stock: 470/1100* ? OC Max: 475/1180**
*this is the same clock as the N517! The eVGA PDF still says the N516 should be 460/1100. What?s up with this?
**Yes, the N518 is a better overclocker. The copper HSF on the N516 is worthless. I?d rather have another N518!
Using 81.95 drivers, it?s possible to run two cards without matching BIOSes, as long as both cards are the same chipset. But I have found that 81.95 only displays clock speeds of which ever card is in the #1 slot! And, these drivers only allow someone to overclock the #1 VGA, and not the #2 VGA.
Let me explain. As you can see from above, I have tested each card installed separately. Coolbits will auto detect 475/1180 while the N516 is installed in slot #1 or while operating as the sole VGA, and 510/1200 with the N518. Again, it detects and clocks as 510/1200 with both cards installed, as long as the N518 is in the #1 slot. But the N516 can?t even clock that high by itself??? What the hell is going on here??
So here?s what I think. 81.95 only overclocks the #1 card while in SLI. I?ve tried Riva and Powerstrip too. Nothing will show or overclock each GPU independently.
Has anyone else had this problem? Any suggestions?
eVGA 7800GT - last4 of model: N518
stock: 445/1070 - OC Max: 510/1200
eVGA 7800GT CO ?SE? ? last4 of model: N516
stock: 470/1100* ? OC Max: 475/1180**
*this is the same clock as the N517! The eVGA PDF still says the N516 should be 460/1100. What?s up with this?
**Yes, the N518 is a better overclocker. The copper HSF on the N516 is worthless. I?d rather have another N518!
Using 81.95 drivers, it?s possible to run two cards without matching BIOSes, as long as both cards are the same chipset. But I have found that 81.95 only displays clock speeds of which ever card is in the #1 slot! And, these drivers only allow someone to overclock the #1 VGA, and not the #2 VGA.
Let me explain. As you can see from above, I have tested each card installed separately. Coolbits will auto detect 475/1180 while the N516 is installed in slot #1 or while operating as the sole VGA, and 510/1200 with the N518. Again, it detects and clocks as 510/1200 with both cards installed, as long as the N518 is in the #1 slot. But the N516 can?t even clock that high by itself??? What the hell is going on here??
So here?s what I think. 81.95 only overclocks the #1 card while in SLI. I?ve tried Riva and Powerstrip too. Nothing will show or overclock each GPU independently.
Has anyone else had this problem? Any suggestions?
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