Graphic card 280 watt psu

I'd say a 7750 is the card for you! Keep in mind that at low resolutions like 1024x800 you may be bottlenecked by your CPU even with a relatively low-power GPU. You should be able to play most things at high settings at 1280x800.

Here you go:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Low profile card that is decent and doesn't require a lot of power:

HD7750

Try the HIS, Sapphire, or PowerColor or VisionTek Low Profile version of this card.

The HIS and VisionTek are for sale from Newegg, but HIS is out of stock.

http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...

http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...

EDIT: Turns out the HIS is in stock now.

The gpu's that you have provided me are pci express 3.0 plus they need 400 watt minimum psu plus i need a cheap graphic card like 50 $ mminimum 100$ maximum

They will run on your PSU no problem. PCI-E 3.0 cards are backwards compatible with PCI-E 2.0 and 1.1, 1.0. You don't have to worry about compatibility. ALl PCI-E cards are backwards compatible.

The measured TDP of 7750's is around 40 watts max load. That's why it should run on your computer.

The next model down would be the last generation 6670 low profiles, but they actually suck more power and are quite a bit slower. FYI, I run those cards on a 250 watt PSU, with a max computer load measured at the wall at <150 watts (CPU+GPU stressed).

Will the 6670 work in my pc ? if yes is there some low profile version ?

Yup you're fine to use a 7750. You don't need to worry about PCI-e 3.0 vs 2.0 - it's all backwards compatible.

It's about a billion times faster than a 7300le as well... I think you'll be very happy with it  

The 6670 *might* work in your PC, because it can be found in low profile, with the full performance DDR5 Vram like this:

http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...

But it sucks 20 watts more than the 7750, and is about 33%-40% slower (average estimate). Plus, you only save a bit of money. If you could stretch your budget, the 7750 is BY FAR, both power and performance wise, your best bet.

i can't afford the 7750 but i can afford the 6670 will the radeon 6670 work for me ?

There are low profile 6670s available:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

However, it draws a little bit more power than the 7750 and is about 40% slower. The only reason to get it over the 7750 is if your budget absolutely can't stretch the extra $30 or so.

one of my friend told me that my pci express slot have just 25 watt will the 7750 work with that ?

The 6670 will work for you just fine, though I agree that the 7750 is the better choice.

Both are huge upgrades from what you have now  

Since PCI-E 2.0 and up are 75 watts (to 150) max per slot, not 25. That's why TDP's of slot powered cards are limited to 75 watts. You are fine.

Below from Wikipedia on PCi-E:

"
PCI Express cards are allowed a maximum power consumption of 25W (×1: 10W for power-up). Low profile cards are limited to 10W (×16 to 25W). PCI Express Graphics 1.0 (PEG) cards may increase power (from slot) to 75W after configuration (3.3V/3A + 12V/5.5A).[9] PCI Express 2.1 increased the power output from an x16 slot to 150W so that some high-performance graphics cards can be run from the slot power alone.[10] Optional connectors add 75W (6-pin) or 150W (8-pin) power for up to 300W total."

Hmmm... I think his slot is PCI-e 1.0, not 2.0

http://support.dell.com/support/edocs/systems/opgx620/e...

Not sure if that changes things or not... I'm not that familiar with working things backwards to PCI-e 1.0. It does say that he's looking at 25W max, though.

my geforce 7300 le is pci express 2.0 and it works fine in my pc so the 6670 will work fine but the problem is the 25 watt maximum

what about the ait radeon 4550 i heard that is take less then 25 watt is it good for 2011 games and 2012 like battlefield 3 ? i mean in low settings or maybe medium settings !

Your slot is PCI-e 1.0, not 2.0, if I looked up the correct specs. You may just have a PCI-e 2.0 card in there.

Honestly, I would still be inclined to put a 7750 in there and see how it does. Odds are that it will work fine. I wouldn't spend any money on anything weaker than a 6670.

What you really need is an entirely new rig, unfortunately  

I used 4670's on older Pentium 4 boards with PCI-E. It says in that Wiki article that the board can increase the power to 75 watts "after configuration". I'm not sure what this means exactly...

EDIT: Okay, I tracked this down. It is 25 Watts on bootup, then maximally 75 watts after driver loaded (power draw configured) and in application. So you should be fine with at 7750.