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Is my computer overheating ???

Last response: in Graphics & Displays
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sorry if im inthe wrong section i recently purchase a Nvidia Geforce Galaxy 275 896mb 448bit GDDR3 into my system which suffered a random turn off

CPU:
E6300 C2D @1.86GHZ and @1.40GHZ

MOTHERBOARD :
Foxconn 945 7mc motherboard

RAM:
2x1gb ddr2 corsair xmc2 ram

OPERATING SYSTEM:
Windows 7 Premium sp1

GRAPHICS CARD:
Nvidia Geforce GTX 275 graphics card.

pOWER SUPPLY:
Antec 500w Power Supply Unit.


What happened is i installed my new graphics card (GTX 275) from my old guadro fx3400 and i installed the new drivers from nvidia.com. and i play a couple of games on max settings = Just cause 2 optimal settings, Bioshock, Aliens vs Predator high w/o aa, and Viva pinata and sim 3 and after that i played Crysis high setting w/o aa
got about 15/20 minutes into the game and my computer turned itself off BTw forgot to mention all games at 1920x1080 res 32"moniter/tv. i turned it back on the psu fan revved very loudly blowing warmish air out of the back of the case and turned off i waited for 5mins for it too cool down turned it back on entered bios cpu temps were at 58.c and motherboard was at 47.c i have a stock cpu cooler and the Arctic Cooling Accelero Xtreme III attached to my gpu as it came in the box and no case fans. My case is the stylist digital pc case which supports back a 120mm fan,two side fans 80mm and 140mm/120mm. and two 80mm fans at the front never o.c was thinking of o.cing Gpu but not with a weak power supply i was wondering if there any reason why it turned off and my psu fans revved up so loud do i need a new psu? or case cooling not sure about gpu temps dont know how to check thanks for any replys any information needed please ask :) 

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Graphics card Authority

Run prime95 blend around 30 mins or so (to see max cpu temps). Afterwards run furmark for 20min (for the gpu max temps). Tell us how high it gets and if it doesn't turn off, it's not an overheating issue on those parts

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i ran furmark burn in didnt know what test to run i ran it for 15mins then screen froze with lots of white dashes along the screen had to swith pc off by back of psu and turn pc back on temps before it froze were gpu core was at 97.c and gpu board was at 80.c i checked idle temps when restarded pc for gpu which are gpu core =42.c and gpu board is 37.c
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