Unstable system after installing Sata 6gbs pci card

Hi guys,

I recently added 'ASUS U3S6, 2x USB 3.0/2x SATA 6Gb/s, PCIe x4' to an available PCie x4 slot on my motherboard (as it has only sata II ports) to install a new SSD to run windows off.
Since, ive had some issues, first of all after a few hours of playing a game, the computer just turned off and wouldn't turn back on - bought a new 450w PSU (same as one that had died), again when i got round to playing for a few hours or so again, the same thing happened, except my computer did end up turning back on.

Meanwhile, i had been getting the odd blue screens, saying something related to hardware being fitted properly i think. This seemed to happen at more intensive use; watching movies, streaming etc - and when it happened, the screen blanked out once or twice and lined out n stuff before the blue screen kicked in.

I was hoping the problem was that a 450w power supply wasn't high enough, so i bought a 600w one for good measure. While i havent properly given it a run at gaming yet (where it seemed to burn out the psu before), ive still had the odd blue screens.

Had neither of these problems before installing the new pci card and ssd.
What do you guys think?

You think it might be adviseable to get a new motherboard instead - if so what would work with my setup?

Intel Core i3 540 @ 3.07GHz
4.00 GB (2x 2GB) Dual-Channel DDR3 @ 666MHz (9-9-9-24) - kingston hyper something or other
Gigabyte Technology Co., Ltd. H55M-S2H (Socket 1156)
AMD Radeon HD 6850 Series (Sapphire/PCPartner)
488GB Seagate ST3500413AS ATA Device (SATA) 32 °C
488GB Western Digital WDC WD5000AAKS-00M9A0 ATA Device (SATA)
125GB SanDisk SDSSDP128G SCSI Disk Device (SATA-SSD)
ASUS Xonar DS Audio Device (pci card)
ASUS U3S6, 2x USB 3.0/2x SATA 6Gb/s, PCIe x4 (pci card with ssd running windows)

Any help would be massively appreciated,

Thanks in advance!
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  1. The HD 6850 minimum recommended power supply is 500 watts. An add-on card requires power too. No name generic power supplies aren't recommended. I would correct the below minimium power issues first. Stay away from cheap low-end power supplies.
  2. Yeh I've got a corsair psu, so hopefully that should do the job. I'll give it more of a run around then to see how it copes.
    If I wanted to consider a motherboard, what could I get for under £100 that would be compatible with the rest of my components?
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