4870 Overclocking Thread

[Blkout]

sorry to nitpick but this caught my eye.

1100mhz in CCC = 4400mhz RAM clock

400mhz is a huge OC, I only ever run my cards at 1125 for suicide bench runs. 24/7 at 1100 will most definitely kill your cards RAM. 1025-1050 is the safe range

What proof do you have that running 1100MHz will kill your memory? Unless you've been volt modding your memory, whatever you achieve on stock cooling, whether it be 1100MHz or not, isn't going to kill your memory. Mine ran at 1100Mhz 24/7 for just over 2 weeks before I sold the card to buy a 4870x2. Never once had any issues with those speeds on stock cooling, and the only adjustment I made was setting the fan to 30% in the profiles, which is hardly extreme.

[SNiiPE_DoGG]

What proof do you have that running 1100MHz will kill your memory? Unless you've been volt modding your memory, whatever you achieve on stock cooling, whether it be 1100MHz or not, isn't going to kill your memory. Mine ran at 1100Mhz 24/7 for just over 2 weeks before I sold the card to buy a 4870x2. Never once had any issues with those speeds on stock cooling, and the only adjustment I made was setting the fan to 30% in the profiles, which is hardly extreme.

did you miss the part where i said it killed the ram on one card? apparently you did

[0ut0fstep]

Snipe man I have some respect for you but even you should know in the pc world NOTHING is manufactured perfect. Thats like saying well I oced my northbridge and it blew up this board must suck. Its luck of the draw you know this. The only reason your memory should be killing itself is if you are getting artifacts. 1025-1050 is usually a safe bet and above the rated speed of these 40x chips so if your running at 1100 your pushing it and should expect something to break. The qimonda chips arent bad and with a lucky card you can take them past 1100 and with a unlucky card you might not reach 950 they are specced for 900.

My card starts to artifact at 1073 and when I mean artifact I can run ati furrycube for hours without it erroring but if you watch closely there are random yellow dots that pop up but its not bad enough for it to toss the error up so I am happy at 1050 or I need to volt-mod.



As for the poster above with all the questions you can mod the stock heatsink for the backside of the card. I run all day at 825/1050 and the vrm doesnt break 100c even with furmark. The HR mod is great but not needed unless you want too.

[junkmonk]

As for the poster above with all the questions you can mod the stock heatsink for the backside of the card. I run all day at 825/1050 and the vrm doesnt break 100c even with furmark. The HR mod is great but not needed unless you want too.

pretty nice overclock

I read about modding the backside somewhere else as well. Basically you add an aftermarket cooler for the GPU only (such as HR-03GT or Accelero S1) but cut/modify the stock heatsink to still cover the VRMs? Any pictures of this?

Also, right now NCIX has a good deal on the Accelero S1 R2... $19.99
I'd like to save on shipping and buy it with the card. Is it possible to mod the stock heatsink as per above to cover the VRMs while leaving the Acclero to do its job? I know the Accelero S1 is a little weaker than the HR-03GT, but with the turbo module (or without) is it still worth it? I think I also read its necessary to do something to the VRMs as otherwise they are not covered by Accelero S1. So whats a better idea 4870 stock mod, or aftermarket sinks? Also FINAL question - does the Accelero S1 cover the memory modules? Or do they need aftermarket sinks for SURE? I know I'm such a damn noob with all these questions... sorry. I love overclocking and have only just started to get into it last year. Hopefully someday I'll be the one answering all the questions.

[Blkout]

did you miss the part where i said it killed the ram on one card? apparently you did

And you have proof of this? Overlocking the memory did this? Can you explain how this happened to one card and hasn't happened to millions of other people that are overclocking their memory? If this was a widespread problem I might agree with you, but a single case here and there leads me to believe it has more to do with the quality of the card itself, not overclocking the memory. There are bound to be a few defective cards out there somewhere, but memory degradation without voltage increases simply isn't likely. Anyone who's been around PC's long enough will know that. It's no different for SDR, DDR, DDR2, DDR3, DDR4, and now DDR5. Memory is memory whether it's on a video card or not, it all works pretty much the same. Memory degradation without voltage increases just doesn't happen unless you're talking about very long periods of of use, such as 7-10 years.