ok a guy came to the Tomshardware IRC and said that he installed a VGA Silencer on a 9800pro
before he had no problems. now he gets artifacts in games. so i immediately thought heat, told him to underclock it. he tried, and it fixed it. then he told me he did both the core and ram.. told him to try just the core. nothing. underclocked the ram, fixed the artifacts
now WHY would installing a new heatsink affect his ram? he said that he was pretty careful and he sounds like he knew what he was doing. told him that perhaps he put a nick on one of the traces going to the ram, but he said he couldnt remmeber anything like that happening. he also said that he used a screwdriver with a magnetic tip (didnt know at the time) , so i wonder if that has anything to do with it
im posting for him, ill update if he finds out anything more.
maybe he got thermal paste on the ram O_O?
orrr the heatsink is drawing more power out of the board than the old one so the ram voltage needs to be jacked up?
maybe the heat from the heat sink being transfered to the ram? i donno :S
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before I got install my own heatsink to my 8500, I could flash the ram to 250MHz, it runs everything fine without artifact, but once I installed mine, it can't even do 240MHz, i think the max is about 235MHz..anything above, i got artifact badly..
So I removed it, and installed a smaller heatsink, but I was much more careful this time (Pressing harder on the heatsink, put some more thermal grease etc ) then turn on, now it can do 245MHz with only very little artifact, not easy to notice, ( I use 3DMark2001's nature test btw), so I back on 243MHz, now it's working fine 24/7 now..
so my guess would be...either he didn't do it properly? or he didn't have a good air flow which makes ram too hot?
Note: the ram on my 8500 is some crappy electrotech 4ns, clocked at 230MHz when i got it.
seems like something got physically damaged. but why would it cause his ram to not clock as high? its seriously wierd. i wish he had a voltmetre so he could test the vram, perhaps he got something wedged uner a resistor that just happens to be conductive? it could happen i guess.. i cant think of anythign to explain it
Well with the VGA silencer, it does hover on top of the ram so there is a lot of local heat here. Also if the RAMsinks are copper will make the situation worse. Put a decent fan on the side that will blow outside air right on the card. Im using a 120mm fan on my side.
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he took the side of the case off, and blew a table fan onto the card and it made no difference. theres no ramsinks. and he put the original heatsink back on (to counter the theory that the vga silencer is holding heat over the ram) and the problem still happened
I would say he physically damaged sth..
Take my 8500 for example (again, yay!). The first time I removed ATI's stock heatsink, the first thing i saw on the graphic core is the thermal paste ( I think),
so first idea comes to my mind is to remove it, since I didn't get any alcohol or ethanol, I removed the thermal paste in a kinda violent way (sorry I can't find the word due to my crappy english :frown: ). When i get it done, I've notice that the 8500 chip is kinda scrached a lot, the prints that were on it are half gone. And then I put JB Weld on it, and <b>only</b> JB Weld..
then the story continue..it can't go pass 240MHz..max is about 235MHz and blah blah..the second time I removed the heatsink, I got alcohol with me, and remove the JB Weld carefully, put the thermal grease in the center of core, and apply some some JB Weld at the edge of the core aroud the thermal grease, then it still won't do 250MHz like beginning, but it did up to 245MHz, which now I'm running at 243MHz..
The overclocking of the Core however, didn't decreased, it can still go up to 300MHz (max I went, didn't try any further), which I'm running at 275Mhz..
So my guess again, would be that he might damaged sth physically.. like stupid me