Dell Studio 540 upgrade

[clynnc19]

Hello I currently have a Dell Studio 540 and would like to upgrade the power supply and graphics card. I use my computer mainly for gaming. I can play the Witcher on medium but would love to play it on the highest settings. The most demanding game I have at the moment is Mass Effect 3, which I can't play at all. I have never upgraded a PC before so I'm a little nervous that I might end up breaking my computer. Here are my specs:

Model: Dell Studio 540
Processor: Intel Core 2 Quad CPU Q8200 @ 2.33GHz, 2336 Mhz
Graphics Card: ATI Radeon HD 4350
Memory: 4 GB
Hard Drive: Not sure (lost manual) but according to my computer I'm able to use 581 GB
PSU: 330 I think but not sure

I'm hoping to spend around or under $300. After reading other threads I was thinking of going with this PSU:

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And this graphics card:

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Would these be good replacements? Any help will be greatly appreciated. Thanks for your time.

 

[RazerZ]

I would get these two, only $140

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Video Card: MSI Radeon R7 260 1GB Video Card ($89.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($49.99 @ NCIX US)
Total: $139.98
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-15 11:42 EDT-0400)

 

[clynnc19]

Thank you for the fast reply. I just realized I also have a couple games that would also require me to upgrade my CPU to a Intel Core 2 Quad 2.4 GHz Processor or better. Any suggestions in that department?

 

[RazerZ]

Thank you for the fast reply. I just realized I also have a couple games that would also require me to upgrade my CPU to a Intel Core 2 Quad 2.4 GHz Processor or better. Any suggestions in that department?

Nothing that would be worth the money. You should consider just upgrading the whole system. Is that ram ddr2 or ddr3? If it's ddr3 you can have a system that you can continue to upgrade and will be a lot better for gaming:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Amazon)
Motherboard: Asus M5A78L-M LX PLUS Micro ATX AM3+ Motherboard ($46.18 @ Newegg)
Video Card: MSI Radeon R7 260 1GB Video Card ($89.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($49.99 @ NCIX US)
Total: $296.15
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-15 12:16 EDT-0400)