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Zalman woes

post #1 of 10
Thread Starter 
I just installed my Zalman VF700cu and am artifacting at 580 core lol. I was running 600 core on stock cooling, so it's obviously not seated well. I'm almost wondering if I should've left the stock cooler on because I used to run the fan at 100%. It was loud, but it kept my card VERY cool. I can't turn the fan up any higher on this one, so I hope to God it'll cool at least as well as my old setup. I can say this though, the darn thing is quieter than I expected. I definitely love that part of it. Oh well, let's see what a reseating does. Stay tuned........
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post #2 of 10
yeah they are nice and quiet. i saw no improvement in my overclock with a zalman on my x800gto2 but the noise difference was worth it. i agree that it is very unlikely to be your new zalman that has lowered your core. good luck with it and enjoy the peace and quiet at least.
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post #3 of 10
Thread Starter 
Well, I reseated the Zalman and saw that my core was running way too hot still, so I investigated further and noticed that the fan wasn't spinning at all. Turns out that I had a bad 3 pin lead on the wire, but that was easily fixed. I now can run 600 mhz core with no artifacting, so I'll see what this baby can do over the next few days. I'm gonna let the AS5 cure a tad before doing my volt mod and going nuts. I'm a little surprised that the memory can't hold the clocks that they did on my stock, but I'll work on that later. Gpu core is far more important anyways and I'm sure I can fix the memory by sticking a fan on them. Perhaps the paste tape will improve over the next 24 hours, but I'm not too concerned. If I can get 640 core or so, I'll be happy. Gpu core tops out at 59 C at 601 mhz, so I have plenty of room left.
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post #4 of 10
Quote:
Originally Posted by sccr64472
Well, I reseated the Zalman and saw that my core was running way too hot still, so I investigated further and noticed that the fan wasn't spinning at all. Turns out that I had a bad 3 pin lead on the wire, but that was easily fixed. I now can run 600 mhz core with no artifacting, so I'll see what this baby can do over the next few days. I'm gonna let the AS5 cure a tad before doing my volt mod and going nuts. I'm a little surprised that the memory can't hold the clocks that they did on my stock, but I'll work on that later. Gpu core is far more important anyways and I'm sure I can fix the memory by sticking a fan on them. Perhaps the paste tape will improve over the next 24 hours, but I'm not too concerned. If I can get 640 core or so, I'll be happy. Gpu core tops out at 59 C at 601 mhz, so I have plenty of room left.

Make sure when you use the rubber spacers on each side of the card. I made that mistake and the cooler was very loose and moved around.
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post #5 of 10
Thread Starter 
Ok, I've definitely gained some gpu core, but I've lost some memory speed. I don't want to push the gpu for another 24 hours, but most definitely I can clock higher. So far, I've lost about 15 mhz memory speed,though.
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post #6 of 10
Thread Starter 
This is really starting to puzzle me. I have most definitely lost a lot of memory overclock. If you know the design of the X850XT, you'll know that half of the memory is sitting on the bottom of the card, so that entire section hasn't changed except for the fact that they now have the Zalman heatsinks on them. On the other side, those memory modules have the fan blowing across them, so they can't possibly be the weak link. All I can gather from this information is that the Zalman heatsinks are actually doing more harm than good. I had read this on a review before stating that heatsinks on memory were garbage and I had posted this long ago, but was rediculed and told that I was crazy. Has anyone ever removed the Zalman heatsinks and had higher overclocking after doing so? I'm <---> this close to doing it because I cannot believe I've actually lost some memory OC by adding the Zalman. It simply doesn't make sense. Btw, for anyone reading this and thinking the Zalman sucks, that's not my point at all. The Zalman is not only a TON quieter, but it also improved my gpu OC. I'm only struggling with the memory modules and do not want to place another fan in my case blowing on them. I'd be happy if I could get them back to 1266 mhz like I could with stock cooling. Any ideas?
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post #7 of 10
I have the same mem clock after instaling those passive cooling heatsinks as when I had asus active cooling on memory so they are cooling that mem. You can buy heatsinks from some other manufactor and try them. They cost about 6$ and before that you can test your mem core without the heatsinks.
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post #8 of 10
Thread Starter 
Quote:
Originally Posted by SEGAos
I have the same mem clock after instaling those passive cooling heatsinks as when I had asus active cooling on memory so they are cooling that mem. You can buy heatsinks from some other manufactor and try them. They cost about 6$ and before that you can test your mem core without the heatsinks.
I know that buying copper heatsinks and using Arctic Silver Adhesive with fans blowing directly on them will improve my OC, but I'm not willing to do that. I don't want another fan blowing inside my case and aluminum are better passive sinks for video ram than copper. Copper is good at sucking up the heat,but not at dispersing it, so additional fans would be necessary. I guess what I'm looking for is someone that has actually ran their card with/without the Zalman heatsinks and can post some results. I really don't wanna remove them to test because it will ruin the paste pads and I'll end up using AS adhesive lol. I really don't wanna do that because that will make it permanent!
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post #9 of 10
Its very risky to remove GPU ramsinks once there on as you could end up pulling the whole chip off.
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post #10 of 10
try just getting those OCZ ramsinks, and positionaing them as to allow the zalman's fan to blow air over them, that's half the reason why the VF700CU is good... it allows airflow over the rest of the card from the HSF...
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