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nVidia G70 (7800 Series) Variable-Domain Clock Overclocking

post #1 of 33
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So, little background first. For those of you that don't know, the G70 has its core split up into a couple of "domains" and each runs at a different clock speed based on the "total" input clock speed. Has something to do with the chip being designed around notebook GPU technology or whatever..
Anyway, as I was overclocking my 7800GTX and monitoring temps with Riva Tuner, which also monitors the clock speeds of each domain, I noticed that it runs fine with no artifacts at 495MHz on the core, but artifacts like nuts at 500Mhz. I couldn't imagine why 5MHz would make such a difference. But it appears the reason is in going from 499MHz to 500MHz, two parts of the core, the ROP domain and the Shader domain, switch from 486MHz to 513MHz! Anyone else ever monitored this kind of stuff? It surprised me that those two domains stayed at 486MHz from 490Mhz total core to 499MHz. I figured it would've scaled up for each single hert. The other domain, the Geometric domain, seems to scale a little more consistantly, and it runs higher than the other two. So it appears that the limitation of my core is either on the ROP domain or the Shader domain. Running about 78-79C on stock cooling as well.
    
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post #2 of 33
Yup I noticed it.
490 is stable no matter what the drivers or temps but go above that insta artifacts.
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post #3 of 33
So can you control each separately? Or can you only control the core as a whole?
Very nice!
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Very nice!
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post #4 of 33
Thread Starter 
Quote:
Originally Posted by J3r3my
So can you control each separately? Or can you only control the core as a whole?
Nope, you just have one slider in the drivers, and strangely enough none of the domains run at the setting you specify, either below or above. I'm hoping that someone will soon write a program to control them independantly, but then again, the clock speeds might be determined on a hardware or BIOS level.
    
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post #5 of 33
Will proper cooling alleviate the automatic artifacts?
Should, right?
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post #6 of 33
Thread Starter 
Quote:
Originally Posted by tweako_420
Will proper cooling alleviate the automatic artifacts?
Should, right?
That's what I'm assuming. Microprocessors operate more efficiently the cooler they are, cooler load temperatures will narrow the gap between the gates slightly and make for better electron flow (better clockage basically ). I just thought it was interesting that it's at the exact moment those two domains make such a large jump in frequency that I get artifacts. Oh, by the way, what did ya'll's cards "auto detect" at? Optimal frequencies in Coolbits gave me 512/1352.
    
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post #7 of 33
Hmm, I noticed just such a thing at pandapimp's house like an hour ago! LOL! I was wondering why 500MHz wasn't working, though he did claim that he had it at 520 for a while be sure the tell us as soon as you figure this one out yiffy!
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post #8 of 33
Optimal frequency 490,1350
Running at 500,1350
Tho usually I keep it at 490.1350 cus some drivers dont like going above that.
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post #9 of 33
Quote:
Originally Posted by YiffyGriffy
That's what I'm assuming. Microprocessors operate more efficiently the cooler they are, cooler load temperatures will narrow the gap between the gates slightly and make for better electron flow (better clockage basically ). I just thought it was interesting that it's at the exact moment those two domains make such a large jump in frequency that I get artifacts. Oh, by the way, what did ya'll's cards "auto detect" at? Optimal frequencies in Coolbits gave me 512/1352.
**Offtopic**
Ya thats why I am getting a Big Typhoon, since I am stuck at a low Vcore, im hoping the extra cooling will allow a bit more of an overclock without more vcore.
Cant wait to see.
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post #10 of 33
Thread Starter 
Quote:
Originally Posted by tweako_420
Optimal frequency 490,1350
Running at 500,1350
Tho usually I keep it at 490.1350 cus some drivers dont like going above that.
That's pretty good. Doesn't artifact too bad at 500MHz for me, could probably run it if I wanted. Need to work on the RAM now though. I wonder how many other people meet their limit at the 500MHz mark...
    
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