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OC GTS 450 on unsinked 3+1 VRMs... low risk or suicide?

post #1 of 11
Thread Starter 
Now I know I'm probably one of the most VRM-knowledgable people on this site but my knowledge falls a bit short when it comes to the video card. I do know however that VRM issues are apparently a number one cause of card failures. The Chimp Challenge is coming up so I'd like to get my GTS 450 (this model) OCed nicely for moar PPD!

The GPU's cooler does blow up onto the card and onto the VRMs as a result, but being a rather lowly 3+1 phase, the card stock TDP being 106W, and now that I will be overclocking this will likely heading into the 140W and up range, it does get me quite a bit concerned since with the Chimp Challenge this will be folding straight through for hours on end. I'm considering overvolting (if it actually gets you some decent headway), but unless I can get that VRM cooling, I really don't want to be doing that. I don't want to kill the thing, especially because I got it for a good $65!

Low risk, or suicide? VRM cooling worth it? I can probably pull some VRMsinks off OCN market for real cheap but the thing is it might take too long to ship and by then Chimp Challenge starts. I'd rather fold this with some OC to a safe limit than nothing.
post #2 of 11
Put one of those spitfire VRM heatinks on with a delta fan no worries now.

Edit: Forgot you will have to modify the heatsink so it can fit the pcb.
post #3 of 11
Low risk.

The vrms are made to power that gpu specifically. That and the 450 uses like no power.

Edit: and if you can pull 140w with a 450, i'd be pretty amazed.
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post #4 of 11
Just grab some heat sinks.

These are what I used on my brother's 460:
http://www.sidewindercomputers.com/scvgachcokit.html
 
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post #5 of 11
Thread Starter 
Well, it is a reference design. nVidia has been known to underpower a lot of reference designs...
post #6 of 11
Quote:
Originally Posted by xd_1771 View Post
Well, it is a reference design. nVidia has been known to underpower a lot of reference designs...
Seems like that has only been an issue with the GTX570 and the GTX590, I would hardly say that Nvidia is KNOWN for not having enough VRMs.
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post #7 of 11
Most VRMs can pull over what the base TDP is set for.
For example, the 570 has only 4 VRMs as well, and it pulls about 225w.

Also, just to remind that the card is pulling 75w from the PCIE slot, and the rest from the PCIE connection.
Meaning if the card pulls just 106w, it can pull an extra 44w from the PCIE power cable (if its a 6pin one).

Most likely you should be ok. The heatsink on the gigabyte gts 450 blows a bit of air on the VRMs, and you should be ok as long as you don't push it too much.
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post #8 of 11
Here is some insight on my GTS 450 . At first i was suicidal, and overclocked to 1 GHZ @ 1.62V. Keep in mind that this was all with a low end, basic GTS 450 from EVGA. I believe it degraded VERY quickly, or wasn't stable from the start. Now it wont even reach that number without a reboot. It's now chilling @ 1.1V @ 934 Core and 2200 MHZ memory. On a GTS 450, as the temp passes 70C, it looses stability. Be aware, even though the card is small, it still pours out TONS of heat when overclocked.
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post #9 of 11
Thread Starter 
The 570 uses a 4+1 actually, this 450 is a 3+1. If they do indeed get very hot when OCed than it worries me slightly

Now Blazing angel, was your EVGA GTS 450 VRM cooled? I think EVGA uses different coolers with bigger plastic shrouds so it's harder to see whether they are VRM-cooled or not. I have nothing on the VRMs at all, just some air from the cooler blowing on it

Just to let you all know my stock VID is 1.087V (pretty high but I've been told this is not necessarily a bad thing)
post #10 of 11
I had a gigabyte GTS 450 running 24/7 for a couple weeks at 96c no problem. They are tough. And yes, they have a really $hitty cooler. Just max the fan.
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