I have an AMD phenom 9750 quad core and an nvidia geforce 7025/630a with 4 gb ram. I went into bios to allocate 512 mb vram but there is no option there. I wanted to do some pc gaming but am unable to do so due to the 256 mb vram. Any help will ne appreciated.
@mastershake575: i wanted to play team fortress 2 and other team based games
You can open your side panel of your case and see how many watts your power supply is. If its decent (250 watts or more) and your case isn't super small, you could technically add a low powered video card that will at least give you some gaming capabilities for older titles. You can check ebay and see if you can find a used AMD 7750, 7770, or nvidia 750 Ti
If buying new, the RX 550 and gtx 1050 are decent.
Luckily the processor that is in the consoles (PS4 and Xboxone) are both pretty mediocre. What that means is even though your CPU is old, it should still technically run games if you upgrade the GPU (you'll have to turn the settings down and your frames aren't going to be high but the games will still be playable depending on what GPU you buy).
You mentioned Team Fortress 2 which will easily run on that CPU if you upgrade the GPU.
i am thinking of getting an HP Envy with a i5 processor and the Nvidia GeForce GT 750m. Is it decent for gaming?
Laptops are usually bad bang for your buck when it comes to gaming. Due to the size/heat factor, processors are usually clocked low and the GPU in the laptops are usually significantly slower than the desktop counterpart.
Unless you need the portability for school/work, i would invest in either a new desktop or invest in a video card for your current computer depending on what games you want to run