These are right choices for a gaming rig?

Your gaming performance isn't going to be improved much, it's mostly the GPU that matters. Maybe get 4GB of RAM and keep your old hard drive to try and get a better GPU or at least an AM3+ motherboard so it is compatible with new CPU's.

CPU-Amd altholon x2 5400+ upgrade to a processor Amd phenom x4 955 will make a visible difference. The 5750 is not bad if you have a small monitor. This article gives better video options: http://www.tomshardware.com/reviews/gaming-performance-... Use the last page of article to compare your 5750 to the new card. make sure you are going up three tiers. Or use this site to compare old and new: http://www.hwcompare.com/3489/geforce-9600-gt-512mb-vs-...

Agree with JMSELLARS1 that you'll want to do video if you are pushing more than a 15in LCD (assuming this PC is for gaming).

Aside, if you are not already using ATI/AMD's build in overclock for your 5750, then use it. It comes in the stock ATI device driver, you just need to turn it on. http://www.makeuseof.com/tag/overclock-ati-video-card-a...

i cant afford a new graphics card   plz tell me about motherboard is this good or not and i dont need good chipset in mobo cause me having graphics card and 2 ram slots can work out.And i dont need am3+ support cause i will only use phenom 955.

760G chipset is so old, if you wanna get phenom 955 it's okay but upgrade your Mobo to the AM3+ socket as suggested and get a 8Gb DDR3 1333 MHz RAM and a better GPU, and this will be considered as a gaming rig

The motherboard you selected is $67 after rebate (from the Egg)

You can find an inexpensive AM3+ 760G motherboard for that price.

The upgrade from the X2 5400+ to the PhII 955BE is a substantial bump --- but the X2 5400+ is still quite a decent chip (especially if it is a Brisbane 65w G2 stepping). It is a drop-in replacement for quite a number of older Dell desktops with single-core early AM2 Sempys.

I'll buy it  

What is the role of chipset if me having graphics card?

Me living in indian and this mobo is cheap there thats y i was getting this mobo and me wanna upgrade cause it giving me low performance in games i think its called bottelneck i m not sure about it o_0.Cause increasing graphics in games doest low my fps niether decreasing graphics doesnt give boost to fps.

for basic operation, this chipset is adequate. The cpu is notcompatible with your motherboard, acording to Asus website The fastest X4 you can get is the 945 or any 95Watts or less CPU. Cut to 4 gigs of RAM unless you really need that much and have a 64 bits OS and check if you really need the 2 TB hdd. Use the extra cash to get at least a HD 5770 or 6770 or even better, a 6850. That will improve your gameplay a lot over the 5750.

then plz suggest me mobo in this price range like less then 70$.   i searced and got this 1
http://www.lynx-india.com/index.php?productID=14198
and plz see this site and get best mobo for me under 3500/-

Gigabyte 880GM Chipset AMD Motherboard: Rs :4200/-

AMD Processor Phenom II X4 840: Rs :4700/-

Roughly the same expense as your Asus M4A78LT-M LE and PhII 955BE.