AC Accelero Xtreme 5870 Review

By on June 28, 2010
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For avid overclockers, the stock cooler on your VGA doesn’t usually cut it.

Editor's Score

The Verdict:
Excellent 5870 Cooler that could have achieved perfection if more thought went into the ramsinks.

The image below shows what you get with the cooler:

Mainly you will notice that you get two ramsinks with basic thermal pads and the bigger heatsink that is used for the VDDC VRMs. All are positioned below the main cooler with the three fans. More images of the cooler:

As can be seen, it is a copper heatpipe with aluminum heatsink design, coupled with three silent fans that run at 2000rpm max and still being barely audible.

Close up image to demonstrate the size of this thing!

Side by side with the Sapphire HD 5870 card that uses the reference cooler design. As can be seen, ACAX 5870 is a few millimeters longer than the reference cooler.

No, the ACAX 5870 cooler is not thicker than the reference model. It is just placed on top of a transparent plastic box to avoid ruining the applied thermal paste. AC claims you can use ACAX for crossfire setups which is something we wouldn’t do.


The accompanied instructions were followed exactly during installation of the cooler. The manual was pretty basic and only highlighted the important steps with hardly any details.

Disassembling the reference cooler from the card was simply done by unscrewing all the black screws. Some of them were hard to remove so care must be taken.

Next thing we did was clean both the GPU, RAM and VRMs from thermal paste/pad remains. The manual instructs to use a tissue to clean the GPU thermal paste and a regular eraser (yes! The very same you use for erasing pencil writing) to clean any thermal pad residue on the RAM and VRMs. Cleaning must be thorough, especially the RAM/VRM erasing part. Keep going at it until the surface feels rigid, this will guarantee that the ramsinks stick properly and won’t fall off.

After placing the Ramsinks (one good way to check that they stick properly is to lift the card by holding the ramsink), the main cooler unit is installed. Pretty straight forward getting it in place.

An angled photo of the installed cooler.

One of the memory heatsinks only held by the thermal pad. Not installing those properly will insure them falling off when placing the card.

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  • RBC

    First off where is the weight differences between the two coolers you mention its heavy but thats about it.
    How about the overclocking results for the card. What about the cpu and case temp differences.
    How about trying different Thermal interface materials and reporting the findings.

  • albalushi

    Hey RBC,

    You got some valid questions and I will try to answer them one by one:
    - I did not measure the weights but I can say that there is hardly a weight difference. I lean towards the ACAX 5870 being slightly lighter than the stock cooler.
    - I did play with overclocking but didn't do anything thorough to report. Though hitting 900Hz on the GPU was a breeze and temps would go up to 55C on it. As for the Memory, due to the quality of both the thermal pads and the ramsinks, they would heat up a bit higher than the GPU when overclocked. No specific numbers available with me.
    - Yeah I forgot to mention the ambient temperature which is around 26C and in the case can be about 28C since I really don't have great airflow going into the it.
    - The GPU has MX2 applied to it so I figured it would do well. As for the thermal pads on the ramsink, I wish I had something around me to replace it with.

    Thanks for your questions and sorry that my answered aren't completely satisfying.

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  • angrysnail

    Thats beast..identical looks like Toxic 5970..btw,is it just fit on the reference PCB of 5870 or apply to all size of 5870 PCB?..

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