Upgraded to GTX675m, overheat/throttling. Heatsink?

i have the 675m from the factory, and i do have the heatsink with the copper bit in..
too bad my card is probably dead now, after 2 years, so i have to change it.

the x-bracket for gtx675m is different than the one used for gtx680 and other cards i beleive...
the x-bracket that is on it from the factory has a small bit on 1 of the side underneath, wich holds the cooling pads for the botton vram chips

 

680M is GK104 too, so 460M/560M X-bracket & heatsink should work well with the 680M too, given my sucess with the 670MX (GK104 too). My 560M X-bracket has the the small section on it to cool the VRAM chips too - this fits nicely with the VRAM chips on the 670MX, and 680M too I would imagine. Does the 580M/675M X-bracket not have that VRAM cooling section?

EDIT: Apologies for excessive use of the word "too"!

Don't know if the post heights for 580M X-bracket is different to 560M? If it's the same, then I think you'd be alright using yours on a GK104 (670MX/675MX/680M/780M)

 

the 675m is a rebranded gtx580.. on fermi arch (gk114)
the stock gtx675m does have the section to cool vram on the underside

little confused here, gtx675m and gtx680m are REALLY different cards (fermi vs kepler)
the gtx680m x-bracket doesnt have cooling for vram as far as i am aware off, but i could be wrong with this

 

Yes, 675M is Fermi, 680M is Kepler. It's just so happens that my 560M (Fermi) X-bracket fits my 670MX (Kepler) perfectly - it's compatible. The VRAM cooling part of the X-bracket fits nicely over the VRAM chips on the underside of the 670MX, so if the 680M has a similar VRAM chip layout, then my X-bracket would have fitted the 680M well too. If the 680M X-bracket doesn't have VRAM cooling, then it won't hurt that your X-bracket does happen to have the VRAM cooler. Perhaps, if you're right about the 680M not having a VRAM cooler on the X-bracket, then perhaps they don't need a cooler, or maybe most 680M setups rely on a cooling pad just placed in the bay of the MXM slot that contacts those VRAM chips.

EDIT: Just checked for pics of 680M (on ebay), and the layout of the VRAM chips on the back is the same as on the 670MX (at least when it comes to the chips covered by the VRAM cooling part of the X-bracket). Here's the links to the pics so you know what I'm talking about:

http://www.ebay.co.uk/itm/Dell-Alie...raphics_Video_TV_Cards_TW&hash=item3a86b65841
http://www.ebay.co.uk/itm/NVIDIA-Ge...786?pt=PCC_Video_TV_Cards&hash=item2a343c6182

And here's a pic of the 580M that you're coming from, you can see that the VRAM layout, at least when it comes to the X-bracket VRAM cooling section, is the same:
http://www.ebay.co.uk/itm/Nvidia-Ge...raphics_Video_TV_Cards_TW&hash=item2585270485

 

Hi!,

So, im back with a final update on this thread.
Problem is now Solved, YAY!

I finally got the new heatsink (580 one?) from Dell.
I've been running Ungine now on extreme for about 15-20 min, and it never goes above 65c.
So, the new heatsink is able to cool it down when reaching 65c and the fan maxes, where the old one didn't and temprature just kept on rising very slowly.

As far as I can see the X-bracket is exactly the same, however, the heatsink itself is composed of other materials. For example more bits connected to the heatpipes seems to be made of copper now hence better heat transfer over to the fan part. When looking back, I can see that Robbo came to the same conclusion as me, I think this could be the "big difference" mate.
One of the pads was missing though so I took one of the old heatsink, and now it works well.

Thanks everyone!