Upgrading a Graphics Card

[Xyrophlex]

Merry Christmas
For this year, I've saved up some money to invest in a Graphics Card for my current PC, which I use primarily for gaming. However, the PC I have has quite a thin case and I therefore am quite limited to choices, making me resort to lower profile brands which I, to be honest, have little knowledge of. I tend to play more high-end (in terms of graphics) games, which I usually doubt my PC can hold. Here are my current specifications:

Chassis - Inspiron Desktop 660 Slim Tower Base
Memory - 6144MB (2048 + 4096) 1600 MHz DDR3
GPU: NVIDIA Geforce GT 620 1GB
CPU: Intel Core i3-2120 Processor (3M Cache, 3.30 GHz)
OS: Win 8 64Bit
This is also a picture of the case I am using, the slim model:
http://www.dell.com/uk/p/inspiron-660s/pd

My budget is around £100, and I will need a GPU that will not take me beyond my current PSU power, which is not listed in the computer specs.
Please give me any suggestions in how I could upgrade my Graphics Card, or any other component that would benefit me more in the way I use my PC.
Thanks

 

[cookybiscuit]

Highest you can go and not switch PSU's is a 7750, pretty quick card and can be had for about 60 quid. Doesn't take any power other than from the motherboard slot so works fine with most OEM PSU's.

 

[ghost878]

Xyrophlex Your dell inspiron 660 has a 300w psu. Thats pretty low for any heavy graphic card. The best i could suggest is a radeon HD7750/6670 both are mid level and have low consumption about 55w

 

[swifty_morgan]

should list the ps if it wasn't included. didn't you think it mattered?

they're not great..... 7750 is the fastest (3rd card)

http://www.newegg.com/Product/Product.aspx?Item=N82E16814125468
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102958
http://www.newegg.com/Product/Product.aspx?Item=N82E16814103236

 

[cookybiscuit]

Also, make sure you get a 1GB GDDR5 version of the 7750, not the 2GB GDDR3 version as its considerably slower.

 

[Xyrophlex]

Thanks for the ideas. however, I'm quite sure my slot for the GPU is PCI, not PCI-E. Am I wrong?

 

[Kisianik]

Thanks for the ideas. however, I'm quite sure my slot for the GPU is PCI, not PCI-E. Am I wrong?

You are. The longer slot on the picture is PCIE x 16, shorter is PCIE x4, so you good, this is your motherboard:

Anything else I can help you with?