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290 GPU throttling after cooler installed

D

Dorosh

n00b
Joined
Dec 1, 2013
Messages
1
Hi,
I've recently installed the Accelero hybrid on my R9 290, and while testing I can't seem to figure out why the GPU is throttling when my core temp is less than 60 degrees now... VRMS are also bellow 70 degrees. It seems like the higher i turn up the clock rates, the more it throttles down.
Before adding the cooler, I could run Kombuster and as soon as the GPU usage was at 100 % the core clock would max out at 947 MHz - Now (everything reset to default) when i run kombuster, the core hover's around 930 MHz. If i run the "stress test (GF OC Test)" the clocks max out.
One big problem is that I score a lower score in 3DMark11...
Please help!
 
It appears to be gpu load that keeps the clocks nailed .. once we get forced voltage in the up coming Trixx then it may fix this as that is how they fixed the HD7950 Boost cards by taking away the Boost range and keeping the gpu to a set clock speed.
 
Strange, I've been playing with my 290 reference with the new beta drivers that disable CCC overdrive, so I'm using afterburner beta latest build and I can OC the crap out of it so long as I get the leaf blower cranked up. If I do that it hits 100% GPU and no throttling at all.

That's a Sapphire 290 stock bios, win 8.1 pro and afterburner 3.0.0 beta 17
 
Probobly not a good idea to used forced voltage, as it competely disable the power features. The card was not engineered to work that way. The 290s dont a static voltage like the 7xxx and prior.

just create a custom fan curve that keeps the temps away from 95.
 
If only happens after installing cooler probably vrm temps. Accelero coolers are known to have garbage vrm cooling. Much better off buying some generic copper heatsinks. The zalman coolers were far superior as they came with a full pcb plate that bolted on. Not sure why anyone ever touched the accelero over the zalmans. Not sure if there is any for newer cards tho.
 
The VRM cooling is fine, provided you use molex power, and not the onboard PWM.

The card wasnt designed for those fans, so it cant spin them fast enough to cool the vrms using the core temp.
 
Running at max to keep from throttling. Not going to make a big enough difference to be ok imo. Running fans at max will keep them JUST under throttling temp. Thats not optimal at all. Thats like saying your cpu runs 105°C before throttling so running it at 104°C 24/7 is totally safe.
 
?

most people have the vrms under 70 with +12v on the fans...

also throttling isnt controled by the vrms, its controlle dy the core.
 
The Mac said:
The VRM cooling is fine, provided you use molex power, and not the onboard PWM.

The card wasnt designed for those fans, so it cant spin them fast enough to cool the vrms using the core temp.
Click to expand...

This is not true. FYI, I've used several accelero coolers and they do not have VRM cooling at all except for fans spinning - which is not adequate; even the reference shroud has sinks + pads for the VRM area. When I used accelero's on the 7970, even the reference shroud had better VRM temps than the accelero did - my core had excellent temps, but my VRM temps had FAR FAR worse temps than the reference 7970 shroud did. It wasn't a huge issue for ME because I didn't get throttling, but the 290X is also far more power hungry than the 7970 vanilla was. I suspect this is the OPs issue. VRM overheating is causing throttling, i'd put money on it.

See this thread:

http://forums.anandtech.com/showthread.php?t=2352824&page=6

He was using an accelero and had better VRM temps with the reference cooler as opposed to the accelero. 85C with the reference, 105-110C with the accelero. Again, i'm nearly certain that the throttling is caused by the inadequate VRM cooling. Simply put, the accelero has garbage VRM cooling. This is why I would never advocate anyone to buy one of these things, and instead wait for a true aftermarket design such as an asus DC II or something along those lines.
 
then he really fucked up the install, once I got all the sinks on my VRMs temps dropped dramatically with the accelero installed.
 
stealthy123 said:
the he really fucked up the install, once I got all the sinks on my VRMs temps dropped dramatically with the accelero installed.
Click to expand...

What the hell are you talking about exactly? The accelero does not have specific VRM heatsinks; the reference cooler does. The cooler doesn't even touch the VRM area, from my use of the accelero on the 7970.

It has a multi finned heatsink that doesn't touch the VRM but will lie a few CM above it with fans blowing over it. That type of VRM cooling is worse than what the reference shroud does.
 
I have never seen the hybrid, but the accellero extreme 3 comes with heatsinks for the VRMs you install before you put the big ass cooler on the GPU core.
 
stealthy123 said:
I have never seen the hybrid, but the accellero extreme 3 comes with heatsinks for the VRMs you install before you put the big ass cooler on the GPU core.
Click to expand...

Oh, I think I know what you're referring to. The little metal pieces in the package, right? That you have to glue on and let sit for several hours. Yeah. The thing is, though, that the actual cooler itself doesn't touch the VRM sinks - it is several CM away with fans blowing over it. Whereas the reference shroud has a *very* tight fit with the sinks, pads, heatsinks and what not.

I remember on the 7970 that the accelero cooler had the actual cooler assembly sitting..like...1/4th of an inch away from the VRM area so it wasn't really an adequate VRM cooling situation despite the sinks + glue.
 
my VRM temps never go above 57c with the accelero and the vrm sinks installed.

If you look at the stock 290x cooler, the vrm cooling is pretty awful, they just use pads to connect them to whatever the metal is on the fan shroud.
 
stealthy123 said:
my VRM temps never go above 57c with the accelero and the vrm sinks installed.

If you look at the stock 290x cooler, the vrm cooling is pretty awful, they just use pads to connect them to whatever the metal is on the fan shroud.
Click to expand...

There seems to be major discrepancies with reported VRM temps. I know the accelero 7970 had god-awful VRM temps, and I know I installed the cooler properly. And with the 290X, lots of reports indicate poor VRM cooling, so I don't know if these guys are doing something wrong or what. But. I know that the VRM cooling with the accelero 7970 was bad. The issue could be related to the fact that the 3 pin fan connector doesn't work on the accelero, it requires the molex to function at full speed. That MAY be a portion of the problem right there, i'm not sure.

Anyone else here use an accelero on the 290X? (I still think it's just better to wait for true aftermarket designs with the 290X, just IMO though)
 
I don't want to throw people under the bus, but I think people dick around with the heatsink positioning to make sure it's even and looks pretty, and in my experience thermal adhesive likes to be stuck on once, crooked or not, and left alone.
 
stealthy123 said:
my VRM temps never go above 57c with the accelero and the vrm sinks installed.

If you look at the stock 290x cooler, the vrm cooling is pretty awful, they just use pads to connect them to whatever the metal is on the fan shroud.
Click to expand...

So you get full cover waterblock vrm temps with little crappy accelero heatsinks ? They're trash everybody whos used 1 knows it. Ill add I highly doubt if vrm temps exceeded their max temp that it would not throttle the gpu. Look at x79 overclocking boards. Gigabyte with inferior vrm cooling like ud5 have bad throttling issues where gpu and voltage will drop to 3.2ghz until vrm temps drop then climb up to your set clocks. So on 290x you can push vrms till they melt the pcb ? There has to be some failsafe for vrm temps.
 
xoleras said:
There seems to be major discrepancies with reported VRM temps. I know the accelero 7970 had god-awful VRM temps, and I know I installed the cooler properly. And with the 290X, lots of reports indicate poor VRM cooling, so I don't know if these guys are doing something wrong or what. But. I know that the VRM cooling with the accelero 7970 was bad. The issue could be related to the fact that the 3 pin fan connector doesn't work on the accelero, it requires the molex to function at full speed. That MAY be a portion of the problem right there, i'm not sure.

Anyone else here use an accelero on the 290X? (I still think it's just better to wait for true aftermarket designs with the 290X, just IMO though)
Click to expand...

other than incorrect installs, ive never seen any acellero or gelid replacements that have had poor vrm temps when using the +12v header for 290/290x.

i really dont feel like reading through that thread, point out the specific post please.

Most likely hes using the PWM header on the card if he had vrm issues.

as has been said above, they come with sinks...
 
With the icy 2 cooler powered by the board fan connector and vrm sinks that came with it , I got 24% fan speed which was 4210 to 4274 rpm at 100% gpu load and vrm 1 max temp was 66c and vrm 2 max temp was 45c

Stock cooler is different with 100% gpu load vrm 1 max temp was 59c and vrm 2 max temp was 76c
 
wow, most people with the icy were getting 75+ on vrm1

i have my icy2 sitting on my table, i havent had the time to put it on.

did you end up using adhesive on the vrm sinks?
 
Last edited:
I got the stock cooler back on for now as I need to order something better to hold sinks on with.. if vrm 2 is the back end (long row) I used the gray thermal pad on the long heat sink which it's not long enough to reach the holes in the board so I drilled the holes alittle bigger and used zip-ties to pull it down like red mod.

vrm 1 is the 3 little front ones I think which I cut a heat sink down to the size of that small one so it had it's own with 3 risers left, other 2 I used the U shape one on those.
 
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