What is your opinion about this system?

There are much better power supplies than Coolermaster, sure their cases are awesome but the reliability of their PSUs is questionable.

$10 less and much better HDD: http://www.newegg.com/Product/Product.aspx?Item=N82E168... - Samsung HD103SJ

The HD5770 should run pretty much any game at high settings on a resolution of 1280x768.

You can get good FPS on much more than 1280x resolutions. The 5770 is good even up to 1920x1080.

I don't like that board or the PSU. I'll start with the PSU.

Coolermaster PSUs are pretty much horrible. Instead, I'd check out the XFX 650W. It's a highly efficient PSU that has gotten amazing reviews. Jonny Guru (who's reviews I personally don't like, but is the go to source for PSUs) gave it essentially a perfect 10 where it matters (it got knocked on its appearance). The PSU is also modular and pretty cheap at $77 after rebate and shipping.

The board is an older chipset. I also can't find a price for it. However, I'd still recommend the ASRock 870 Extreme3. It's got all the major features of the MSI board, but adds USB 3/SATA III support.

Finally, I'd probably swap the Seagate HDD for a Samsung Spinpoint F3 1 TB. It'll be a little faster for roughly the same price. Or course, that's assuming the Seagate is the 7200.12 model. If it's the 7200.11, that "probably" become definitely. The 7200.11 had a massive failure rate and horrible quality.

EDIT: They really dropped the price on the F3 today. I checked earlier, and it was still $65. At $55, you should definitely be buying it.

Why not go for amd x3 450 + Radeon 6850?

I definitely like the PSU. ASRock motherboards are not available in INDIA. thats where I live in.

Ok then I'll have to find something else. I'd say your next best option is the Asus M4A89GTD Pro. It's a bit more expensive than the ASRock would have been (and likely the MSI). Basically, what I'd look for is a board from Asus, Gigabyte or MSI with an 8xx chipset and 8x/8x Crossfire. The 8xx chipsets are newer, and will all support USB 3/SATA III.

thanks a lot dude... so these r the changes i have made
mobo - asus 890gx
psu - xfx 650w
hdd- samsjng finpoint 1tb

Processor - AMD Phenom II X6 1090T

Graphics Card - MSI 6870 1GB

Motherboard - ASUS M4A89GTD PRO [ASUS 890 GX with USB 3.0 AND SATA 3.0]

Case - Cooler Master HAF 922

RAM - Corsair XMS3 2x2GB DDR3 1600Mhz

Power Supply Unit - Seasonic S12D Silver 750W

Heat Sink and Fan - Cooler master hyper 212 plus

Hard Drive - Seagate Barracuda 1tb 7200rpm

what about these?

The X6 is a pretty terrible CPU. It's not all that powerful. You'd get about the same performance if you got the X4 955. Of if you really want a more powerful CPU, the i5-2500K (and a P67 board, like ASRock's P67 Extreme4) would be a lot better.

I'd also swap the Seagate HDD for the Samsung Spinpoint F3. They're roughly the same price, and have very similar performance, but the Samsung tends to be a bit higher quality.

For the PSU, I'd check some prices. SeaSonic's units are great, but they tend to be a bit pricey. Check out Antec, Corsair, Silverstone and XFX as well. They'll be just as high quality, but likely cheaper.

Why so? they are 6 cores. Phenom II x4 955 is quad core.

It's more about the architecture. The X6s, while having more cores, actually perform worse in most applications. They're not any better than the X4 for gaming, but do show significant gains in very specific applications (Photoshop is one I think). All in all, paying an extra $50+ for the X6 doesn't give you that much performance gain. You'd do better to spend that same extra money on the old i5-760 instead.