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Popin caps gtx 275

post #1 of 98
Thread Starter 
so i recently did a vmod to my gtx 275. i had read not to take the core voltage over 1.35 in furmark since the caps blow at 1.37. i had tested the card in furmakr stable in my sig settings at 1.34-35. i played about 5 mins of bad company 2 and POOF. soooooooo heres my question if i just doubled the amount of caps would i be able to hold those clocks or maybe somthing higher???? i have already ordered some from mouser. OEMs are 561/2.5 i ordered 8 561/4 and 8 680/4. i have recently read i should have kept the voltage at 2.5 but i figure ill try em anyway.

anyone have any exp moding these cards. the FPS at 820/1864 were nutz:devil:
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post #2 of 98
i don't know what you mean by double the amount, but keep the same uF value and increase the voltage tolerance. this should give a bit of elbow room, then it just depends on the other components' tolerances.
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post #3 of 98
Thread Starter 
Sorry. i ment double the amount of caps. it has 4 i was going to try to run 8 insted and just run them parallel. i had read in a capmoding guide that going with a higher voltage would be bad?? inted just to run more of the same caps. Is it also true that multiple smaller caps is better than a few biggins? this is supposed to keep the ESR lower.

currently i have some 1000/6.3 on the card and im just using the 2d(interwebz/movies) functions untill my other caps get here.
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post #4 of 98
I will usually use the same voltage caps when possible, just with some higher capacitance (like 860uf 2.5V in parallel with 561uf 2.5V).
Furmark is useless as a stability test, you don't want to ever use it on a voltmodded card.
I wouldn't even bother with it on a stock card unless you just want to see how hot it can get.
    
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post #5 of 98
Thread Starter 
good to know on the furmakr deal. i always thought its was kinda lame since it really didint stress the ram of the card at all. i guess just good old fashion face blasting is the best way to test wink.gif.

does anyone know the limits of the power components of the 275s? i know the only have a 6phase PWN compared to the 8 phase of the 285s. i had it at 1.32 in BF when the stock caps went kablooy. i think it would be SWEEET to hit 1900 or 2000:yessir: on the shaders with this card. i should be able to keep the temps down since its the only thing on the water loop with a triple 120 black ice gt rad.

BTW this is my first actual soldering volt mod. i have done many pencil tricks in the past. i am rather decent with a soldering iron tho as solder at my job often.
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post #6 of 98
just be careful with changing capacitance values, depending on the type of capacitor and what its purpose is it can affect the card's performance. electrolytic capacitor values can be raised by 60% in some cases and still be safe, but it is better to parallel them like ftw 420. higher voltages will not affect performance (but they are larger in physical size) and will keep them from popping as easily.


i'm an electrical engineer, btw.
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post #7 of 98
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im trying to learn about low level components as much as i can. i dont want to just find out what works and slap it on there. To my understanding voltage ratings on caps are just that, a MAX voltage value they can handle and are usally a tad bigger than what actual voltage is going through them correct? capacitance is just how much it can hold, and they act like a reserve. Is it true the bigger they get the "slower" they can discharge? this is why i heard multiple smaller ones are better? Like i said in a prev post i ordered a total of 16 alum poly caps, 8-560/4 and 8-680/4. i think they both have a ESR of 5. Soooooooo should i run 4 of each or would it be ok to just run the 8 "bigger" ones.

Thanks for help guys;)
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post #8 of 98
Did you run vantage at all on those clocks? I would love to see the score tongue.gif
    
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post #9 of 98
6.3v caps will be fine. 2.5v would be a little bit better, but you will likely not see a difference in the two.

More voltage isn't really going to help your shader clock. Shaders only need a small bump above stock. After that, the shader clock is all about temps. Lower your temps for more shader straps.

Yea, as FtW said, Furmark is useless. Actually, it has been the cause of death to many V'modded cards. It and OCCT's GPU test should be banned. Search around and you'll see these programs and GPU death go hand and hand. RL testing and ATItool are your best beats.

Gratz on your first hardmodded V'mod thumb.gif

Welcome to OCN cheers.gif
    
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post #10 of 98
Thread Starter 
So as far as keeping the card cool. I have adapted a zalman CPU waterblock on the core and I'm using the stock heatsink/spreader that comes on the msi twin frozr for the ram an MOSFETS. Will removing the IHS help out with temps all that much? Is removing the IHS as dangerous as cpus? I also have some diamond 7 that's supposed to get here today. Interested to see how much better it is than as5.
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