4870 Overclocking Thread

[dejanh]

The way I came up with the 1280x1024 minimum is that I found on my 4870 that it did not overheat or crash if I ran FurMark at anything less than 1280x1024 in the stability test. 1280x1024 or higher would cause the temps on the VRM to skyrocket and the card to crash. I guess it is a personal experience only...I just went by it anyways. I do agree though that if your GPU load while running ATITool and FurMark in your setup is at or very near 100% for the whole duration that is then good enough.

[Makubex_GB]

The way I came up with the 1280x1024 minimum is that I found on my 4870 that it did not overheat or crash if I ran FurMark at anything less than 1280x1024 in the stability test. 1280x1024 or higher would cause the temps on the VRM to skyrocket and the card to crash. I guess it is a personal experience only...I just went by it anyways. I do agree though that if your GPU load while running ATITool and FurMark in your setup is at or very near 100% for the whole duration that is then good enough.

Thanks for explaining.

[skindogg]

I just put the FC Koolance block on my 4870 over the weekend, and my VDDC temps are in the 80s while gaming and in the mid 90s while run GPU folding client. The GPU itself is in the mid 40s though. I put a dual slot fan right under the card too running about 80%. I'm wondering if running them all day in the mid 90s will kill it or not. Looking at temps in gpuz 0.2.7

I did run furmark and stopped it when they went over 105C

[dejanh]

I just put the FC Koolance block on my 4870 over the weekend, and my VDDC temps are in the 80s while gaming and in the mid 90s while run GPU folding client. The GPU itself is in the mid 40s though. I put a dual slot fan right under the card too running about 80%. I'm wondering if running them all day in the mid 90s will kill it or not. Looking at temps in gpuz 0.2.7

I did run furmark and stopped it when they went over 105C

Thermal maximum for the DVRMs used on the reference 4870 is 125C. Therefore, you are likely fine but if your temps are getting over 110C I recommend you look at some additional cooling.

[Caveman787]

If Im right in considering a Full Cover block covers all thermal point such as ram, voltage regulators and gpu core. He must have mounted it improperly if he's reaching over 100c on the vreg's with it or the block is rubbish.

[skindogg]

The thing is, on the stock cooler, there's that slot next to the right edge where air is getting sucked over the vregs. However on the FC block they are just covered up, but no contact to the block.

I got a slot fan with dual fans blowing up onto the card from right below it, but I think the stock cooler probably cools vregs better than this.

I can't believe the mount was bad since the GPU temps are all in the 40s while gaming.

I guess I was curious as to whether it's ok if the vregs operate in the mid 90s all the time. I'm fine with not running furmark ever. I don't plan on volt modding either.

[Caveman787]

Just because the core is being cooled well doesn't mean it's not bent or something toward the vreg area making not the best contact.

Also I would think the coolness provided by the water and lower core temp would radiate through the block material thereby cooling the vregs better.

You'll be fine in the 90's though as someone else said there spec'ed for 125 degrees celcius.