ATI 6970m or 6990m

Ok so here is the deal:

I will be soon deciding what video card ill upgrade to for my M15x, only one problem:
which one?

I know that the 6990m is better than the 6970m but on these forums there is more support for installing the 6970m.
I have already educated myself on everything in need to know upon installation of a 6970m, is the 6990 any different?
Money is not a problem and i am willing to pay to top dollar for one anyway.
If I get my hands on a 6990m, I would like to know:

What problems I could encounter.
long term effects. (If you have one, that is).
Any installation differences from the 6970m. (Different or modded drivers, or how it fits in the chassis)

If for some reason I cannot use/get a 6990m; I will be getting a 6970m anyway. (The posts in this forums have given me confidence that i am competent to install one; thanks guys for the info.)

 

I'm using a 6990m and it's all the same in installation and drivers as the 6970m
there might be some problem if you have a powerful processor like a 920/940xm and you try to overclock both but I'm running in stock and everything is great
I say go for the 6990m

 

other than heat problems that you need to repaste and repad (it's quite hot), go for 6990m. you'll love it

 

thanks for the info guys im really psyched now, going to get the 6990, but where from? hmmm

 

best from ebays，cheap
u dun wanna get it from dell，its way too high，besides u will need a frd that owns a m17x or m18x to get it from dell

 

cool thx for the info, i will keep checking any other sellers as well tho

 

keep an eye on the NBR marketplace. I got mine there way cheaper than you can ever get from ebay just be patient and look around

 

cool thanks; im going to try that soon, anything i should be aware of in there? (im still new here)

 

I found this on ebay:
ATI Mobility Radeon? HD 6990m GPU MXM 3.0 Type B | eBay

it is a eurocom reseller so it has the clevo vbios i suppose, will i need to flash it?
also: anybody know some good thermal compound

 

I just repasted with shn-itsu (spelling might be off) and it dropped my 460 by 15c and the 920 by 10c

 

cool thanks for the info
also: i was led to this page in my search
80-way Thermal Interface Material Performance Test | Thermal Interface Material,Thermal Paste,Heatsink Compound,80-Way Thermal Interface Material Best Thermal Paste Heatsink Compound Cooling Performance Comparison Benchmark Tests

seems that there are a lot to choose from

 

there is a lot to choose from and the guy that posted before you used shn-itsu, From what I have heard its the best you can buy but its very expensive. I'm gonna use MX-4 because its non conductive and thats what I was recommended by some people on here in the m17x forums just waiting for my card to get here

 

im probably going to pick up some shn-itsu myself, it performed the best in the tests i linked earler

 

That thermal paste review is from 2009. A lot has changed. Check this Sept., 2011 review from Skinnee Labs. The moderate contact section should be the primary focus for most users. 2011 Thermal Compound Roundup – Results Compilation | Skinnee Labs.

 

I think I'm going to buy a couple shims off of ebay; contact is the most important thing.

 

Hello,

I'm French and I'm not very speak english.

I have a Alienware M15x with 5870m and I7 720qm . I'm search a 6970m or 6990m for my notebook.

This card is compatibles for my m15x? ATI Mobility Radeon? HD 6990m GPU MXM 3.0 Type B | eBay

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