Upgrading my PC for gaming. HELP!!

  MichaelRawlings 12:30 10 Jun 2015

So I've got a 4 year old acer aspire m3920 I think. it's got an intel i5 2300 @2.8Ghz, 3gb of ram, 300watt psu, and that's all I know. I'm not a computer whiz and need some advice on what I need to do to upgrade my pc. I'm planning on spending around £100 on a graphics card, also upgrade the psu and ram. I'm wondering if my cpu is up to date and of its good enough for an upgrade. I do not know what the motherboard is but I've posted some pics. I also have a really old graphics card installed which I am going to replace. So could anyone help recommend what parts need replacing and upgrading, thanks a lot for any help.

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