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tieros
03-16-06, 03:44 PM
Since there's an OC thread for the 7900GTX, I thought I'd start one for it's little brother.

Using "detect optimal frequencies", I get 565 core and 827 RAM for the eVGA 7900GT Superclocked.

That's only a 15 MHz bump over the shipped version, but it's 115 MHz over reference. I can set it manually to 575, and it appeared to be stable, but i stick with the suggested clocks.

The thing that amazed me was the RAM. It's 1.4ns RAM. Doesn't that equate to a 715MHz clock? I was definitely not expecting to see it go over 800 :D

(nana2)

Rytr
03-16-06, 04:05 PM
565/1.65 (825) is about as high I can go stable. I did boot at 581 with the core but could not run AM3. The memory made it to 1.7 but no stability.

Samsung 1.4ns is actually 1.429 which does equate to 714.5MHz or 700MHz rating.

Dazz
03-16-06, 04:29 PM
Yeah i heard the eVGA 7900 GT CO SuperClocked is pretty much as overclocked as you can get the core.

tieros
03-16-06, 04:38 PM
I wonder if a little voltage bump to the GPU would help any? :D

I may try it at 1.3 just to see what it can do.

Dazz
03-16-06, 04:54 PM
Whats the temp so far?

tieros
03-16-06, 05:24 PM
OCed, after 2 runs of AM3 and 1 run of 3DM6, the maximum temp was 48C. It's idling in mid 30s.

Life is good :D

DarkOneX
03-16-06, 05:28 PM
I actually had to downclock the core on my eVGA 7900GT CO Superclock to 540Mhz because I was getting slight artifacts at 550Mhz when I ran ATITool. I didn't even notice them in game so they weren't bad but ATITool detected them. I can overclock my memory by 20Mhz though so I'm running 540/1600 which is great. I don't really care that much about having to downclock the core, especially since I can overclock the mem a bit to make up for it. Also I kind of expected that as my old card, BFG 7800GTX OC, I also had to downclock it too for the same reason, but I had to downclock that one like 30Mhz on the core and 50Mhz on the memory to make it run without artifacts so I'm happy with this card's results.

Also, I sold my old card on ebay and got paid for it today, $371, and I paid $349 shipped for this card, so I actually got an upgrade for free + some money lol. :D

Dazz
03-16-06, 05:33 PM
Well they must run alot cooler my GTX slient @ 500/1300MHz runs 48C max and 40C idle. Considering the size diffrence of the GTX fan and the GT fan that pretty good.

tieros
03-16-06, 05:35 PM
DarkOneX, do you have PEG mode enabled on your mobo? It might be the reason why you're having to downclock.

Just a thought.

Dazz
03-16-06, 05:42 PM
It be as the motherboard can overclock PCI-E video cards you should have a setting within the BIOS i know all PCI-E ASUS board have it.

DarkOneX
03-16-06, 05:43 PM
DarkOneX, do you have PEG mode enabled on your mobo? It might be the reason why you're having to downclock.

Just a thought.

Yes I do.

I also just did some more testing with ATITool and checking myself for artifacts using some nVidia demos and seems stable @ 540/1620. :D

Should I disable PEG mode in the BIOS? I thought that was a good thing...?

tieros
03-16-06, 05:48 PM
There's been a couple of reports about PEG messing things up when enabled.
You may want to try it with PEG set to Normal to see if anything magical happens :D

GuOD
03-16-06, 06:34 PM
nm.

GuOD
03-17-06, 10:27 PM
Just a heads up to anyone..

Stock: 550/815 idles @ 50ish and maxes around 75-80c or so

I put a zalman vf700 on today, idles @ 36 and maxes around 50c. clock @ 570/850

i HIGHLY recommend the zalman cooler :)

DarkOneX
03-17-06, 10:31 PM
I've never had any luck with aftermarket coolers for CPU's so don't think I'd wanna try my luck at video card ones. Everytime I've bought some big fancy expensive cooler and used that highly touted AS3 or whatever I end up having the same or higher temps.

Also it says they work for cards up to 7800GTX so how did it work on the 7900?

GuOD
03-17-06, 10:39 PM
I've never had any luck with aftermarket coolers for CPU's so don't think I'd wanna try my luck at video card ones. Everytime I've bought some big fancy expensive cooler and used that highly touted AS3 or whatever I end up having the same or higher temps.

Also it says they work for cards up to 7800GTX so how did it work on the 7900?

It turns out it has the same mounting holes :D

Aftermarket coolers do make a huge difference - there are tons of tutorials online that explain how to do it..but some are more complicated than others.

The zalman video card coolers are really simply.. you CANT screw it up basically! The only time it wouldn't lower temps is if there is not proper contact but this one makes that impossible