8800GTS Overclocking on water

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Pyrex238

Limp Gawd
Joined
Jul 12, 2006
Messages
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I recently had my old first revision 8800GTS bite the dust, and I returned it to EVGA. I recently received my replacement which was (thankfully) an A3 core. On my old setup my max was 620/905 stable.

With the new A3 core I've run several benchmarks in 3dmark 06 and I've stablized 675/955 and I'm slowly working my way higher. I'm pretty satisfied with the results, however 3dmark doesn't seem to respond very well once I get over 640 core - not much of a change. Thoughts - results?
 
My A2 does better than that. My A3 isn't a whole lot better, though.

A2: 675/1566/999 (water)
A3: 685/1620/1080 (air, no water yet)

This kind of stuff varies widely from card to card, however. Also, I use the MCW60 (not a full coverage block) on my 8800GTS cards.
 
Like I said though, still working my way up - I'm currently at 700/985 and working my way up. I'm using a Dtek Fuzion GPU block and copper sinks on my ram - I don't have a full coverage block unfortunately.
 
Full coverage blocks don't generally return as high an OC on the G80s, so I don't know why you say "unfortunately"
 
silent-circuit said:
Full coverage blocks don't generally return as high an OC on the G80s, so I don't know why you say "unfortunately"
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That's interesting. I'm sure that's more dependent on your WC setup too, sounds like the full coverage blocks might be heatsoaking themselves. I would presume enough volume and flow and it would be better, but then again I've never felt my ram sinks to see if they generate a good deal of heat. I switched over to a new case tonight and the fans on my rad are barely even spinning (coolermaster stock fans apparently are 3.3V or something) and I'm seeing gpu peak temps of 43c over about 30 min of benchmarking. Out of all the rads I've owned (PA120.3 included) the best I've ever used by far is the 77bonne heater core (WITH ac) - always worked incredibly.
 
The GPU-only blocks are /all/ far better designed. Full coverage blocks are using what amount to ancient technology in the watercooling world -- just big copper channels. The Fuzion is a nozzle/spray based block, I believe. The MCW60 is a pin-field based block. Both will move a lot more heat. Very few people are running a high enough flow pump to make the full coverage blocks work well. Ironically they tend to be as restrictive (and sometimes, even more-so) as the nozzle based blocks while requiring higher flow to keep transfer efficient.
 
Alright it appears after long testing my max seems to be 730/1880. That's a pretty good OC, righit?
 
silent-circuit said:
Yeah. Without a volt mod, that's pretty good. And volt mods void warranties, so...
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And I came back to the thread to ask if anyone knew how to do that volt mod. Since I'm water cooled, I'm not terribly concerned about a volt mod since heat shouldn't be an issue. do you think it's worth the effort?
 
Pyrex238 said:
And I came back to the thread to ask if anyone knew how to do that volt mod. Since I'm water cooled, I'm not terribly concerned about a volt mod since heat shouldn't be an issue. do you think it's worth the effort?
Click to expand...

Could kill it. You need a variable resistor, a soldering iron, and a considerable supply of gigantic balls. I think MadShrimps has a tutorial thing.
 
silent-circuit said:
Could kill it. You need a variable resistor, a soldering iron, and a considerable supply of gigantic balls. I think MadShrimps has a tutorial thing.
Click to expand...

I'm finishing up my degree in electrical engineering so I think the soldier part and variable resistor portion is taken care of. The gigantic balls part grew in around the celeron 300 days. I'll check with madshrimps. I saw a pretty substantial increase over stock, we started in an average of ~65fps in the opening scene of 3dmark, and worked our way up to ~85fps. The actual 3dmark score is a paltry 11300 - primarily due to my very subtle OC to 3.0GHz on my E6600 - I've had it over 4GHz, but not with 4 dimm's, so i'll start on that later this weekend.
 
My own result with a 8800GTS 640 MB with a EK full cover is 675/2000 (I have the A3 core) without issues. I get over 12,500 3DMark06 with this setup. I didn't even try to push higher as i'm not look to increase my ePeen ;)

 
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