So call of Duty: 4 is out and steadily getting popular but your not sure if your older PC can play it or maybe you need so pointers on cheap upgrades? This is the place to look!
I suppose the 1st thing to do is post what the developers recommend.
Recommended requirements:
CPU: 2.4 GHz Dual Core or better
RAM: 1GB for XP and 2GB for Vista
HD: 8GB Free Space
GFX: 3.0 Shader Support, Nvidia Geforce 7800, ATI Radeon X1800 or better.
Minimum requirements:
CPU: Intel® Pentium® 4 2.4 GHz, AMD® Athlon™ 64 2800+ processor
or any 1.8Ghz Dual Core Processor or better.
RAM: 512MB RAM (768MB for Windows Vista)
HD: 8GB Free SPace
GFX: NVIDIA® Geforce™ 6600, ATI® Radeon® 9800Pro or better
Thats not to bad is it? No need for a super computer and no need to break the bank for upgrades!
1 gig of ram for xp. ram is very cheap if you are still running on 512 let me recommend newegg.com a single gig of ram will cost between 20 and 40 dollars and I will recommend ddr2 800.
The minimum video needs are pretty low but that is the minimum. If you are running PCIe I will recommend 3 cards at 3 price points:
Nvidia 8600GT at $99.99 http://www.newegg.com/Product/Product.a ... 6814150230
Nvidia 8800GS at $169.99 http://www.newegg.com/Product/Product.a ... 6814150276
(For ATi Fanboys like me)
ATI 3850 512 at $172.99 http://www.newegg.com/Product/Product.a ... 6814102715
and the Nvida 9600GT at $174.99 http://www.newegg.com/Product/Product.a ... 6814127332
Still running on AGP?? HAA HAA no kidding Ive got a good one for you:
ATi2600XT at $116.99 http://www.newegg.com/Product/Product.a ... 6814102718
or the
ATi HD3850 512 at $219.99 (a little pricey) http://www.newegg.com/Product/Product.a ... 6814102730
Getting anything more powerful then the above cards would only provide better graphics in more demanding or future games.
Beyond ram and video card the rest isn't all that major. Make sure your cpu is at least 3.2 for a single core or 2.0 for a dual core and your should be good though with a good video card your CPU can meet the minimum and be ok.
I am hoping others can contibute to this post.

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