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MSI GX740 - upgrade to K5000M or GTX 970M

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I want to have some opinions about upgrade my notebook.

It has the now the best I can get to it:

- [email protected]

- 180W AC Adapter (orginal from MSI - it's Delta Electronics charger not, some chinese or Dell's with changed cable)

- HD5870M orginal MSI


And I want to upgrade 5870M. I can have dell K5000M 4gb for ~205USD (let it be 210, because exchange rate is changing)

Or GTX 970M from Clevo SM for 390$.

What you would do ? Is the 970M almost 2x times better? I know that it has some impressive scores, and it's a cool card. 

My 5870M have now in stress max 64C so it's cool. I want to keep it down to 80-85C, nothing more, and good performance.

I don't know if 970m would work, but gx and gt from 1 gen. are compatibile with almost anything I guess (because gx660 works with almost all cards, gx640 works with k5000m and k3100m and k4000m, 765m, so i guess that it also works with the 970m). Or I am mistaken ?

Don't say to buy new or used other laptop - it works well for me, and I buy it for little money, so I want to maximise it without, wasting loads of cash.

Is it possible to overclock k5000m still in gx? I know that it has some problems with coooling, but I take some copper radiators, take of the bottom case and stick it too my fan, so to keep it cool - and it's really cool now - cpu still got 80C in load (but it's 45nm 4c/8t i7 with 3ghz, so it needs to got a little hot with such a thin case), so I assume if my 5870M is so cool (60-64C), k5000M with small OC (maybe to 850/1500mhz), can do max 85C?

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