[quote name=“MrFeathers” post=“40136” timestamp=“1386260583”]
I have 4 sapphire reference 7950s with arctic accelero extreme 3 aftermarket coolers. To be honest I dont like the design that much. They are very quiet coolers and keep the core in the low 60s but I have to keep the fans turned around 70-80% (and this is with a big 24inch fan blowing on them) or something overheats. I think its the VRMs. The design has a critical flaw that makes it bad for rigs. Most cards blow heat out the front or back but these shunt all the heat over the top and right into the fans of the card next to it. Its really bad when you have 4 of these lined up. They just pass the heat down the line, amplifying it until the last card overheats. You have to have a big jumbo fan moving air between them to make sure that heat doesnt get passed between the cards.
Here is a picture of the vent on top of the card. Its a slightly different model but still same vent.
[url=http://content.hwigroup.net/images/products/xl/105881/2/arctic_accelero_xtreme_plus.jpg]http://content.hwigroup.net/images/products/xl/105881/2/arctic_accelero_xtreme_plus.jpg[/url]
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Had the Accelero Extreme (7970 edition) to for my replacement on the shitty XFX 7970. Worked very well for me (need fan to push air through between the cards).
I do concur with having to have the fan speed on 80+%, and yes its due to the VRM overheating. Since the cooling for those is not connected to the main cooling block in needs air circulation strong enough to blow on the small fin block.
Ill see what happens. all the cards mine fine now (noisy as hell though due to 3/4 fan blades ;D). have two that is going to be taken on warranty (sapphire shitty stock fans don’t last long).
If i get the same replacement as last (280X), i will be very happy and just sell the rest with accelero turbo II fans=)