System Manufacturer/Model Number Acer M802 OS Windows 7 Home Premium 64-bit CPU Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GHz (4 CPUs), ~2.7GH Motherboard MB.SCQ07.002 MB KIT G43 ICH10R HMII EUPLOT6 ECS R Memory 8GB DDR2 Graphics Card HD 6970 1 GB Sound Card Realtek ALC 888s Monitor(s) Displays LG FLATRON 23" W2361V Screen Resolution 1920x1080 60hz
PSU Corsair TX650m Case CM 690 II Advanced mid tower Cooling fan Hard Drives Seagate Barracuda ST3750528AS 750 GB 7200 RPM
WD My Book Essential 1 TB external HDD Internet Speed Rogers Express internet.
Computer type PC/Desktop System Manufacturer/Model Number Custom Built OS Windows 8 Professional x64 CPU Intel Core i7 965 Extreme Edition 3.2GHz Motherboard ASUS Sabertooth x58 Memory 12GB Corsair Dominator 1600MHz Graphics Card Zotac Nvidia Geforce GTX470 Sound Card ASUS Xonar DX/XD 7.1 Monitor(s) Displays Dell 24" S2409W + Dell 20" E207WFP Screen Resolution 1920x1080 + 1680x1050
Keyboard Logitech G11 Keyboard Mouse Logitech G5 Laser Mouse (2007 edition) PSU Corsair HX850 modular Case Coolermaster 690II Advanced Nvidia Edition Cooling Corsair H60 Hard Drives 1x 120GB OCZ Agility 3, 1x 750GB Western Digital Caviar Black, 1x 1TB Western Digital Caviar Blue Internet Speed 20Mbps Antivirus Microsoft Security Essentials Browser Google Chrome Other Info LG Blu-Ray player
A couple of things first off with a 250W PSU your going to be very limited with what you can use as a replacement card.
Secondly we need to know what sites you would be looking to purchase from since not everything is available to you as it is to us in the U.S.
Also did you build this yourself or is it prebuilt? I ask because OEM's have a reputation of having specialty parts for their systems and on some or almost most upgrading your PSU to an ATX won't fit.
System Manufacturer/Model Number Self Built OS Windows 7 ultimate 64 bit / XP Home sp3 CPU intel Core 2 Duo E8400 3.0ghz Motherboard Asus P5ND bios 1401 Memory 8 gigs 1066 OCZ Fata1ty Graphics Card EVGA GTX 580 Call of Duty Black Ops Edition Sound Card Creative Soundblaster Audigy 2zs Monitor(s) Displays Asus 24in LCD's 2MS X2 Screen Resolution 1920x1080p @60Hz
Keyboard Logitech Bluetooth Wireless MX5000 Mouse Logitech Bluetooth Wireless MX1000 PSU OCZ 700W GameXtreme Case NZXT Apollo Cooling Corsair H50 CPU/120mm x3 /60mm x2 /Corsair Dominator Ram Hard Drives WD Caviar 500 Black/ WD Caviar 200 Blue Internet Speed Download 19.83 Upload 0.97 Other Info Logitech Z2300 Speakers/ Bose Noise Cancelling Headphones/Avermedia PCI-e Hybrid TV Bravo/Epson NX415 all in one/ 4 Port Powered USB Hub/ LG 10x Bluray Burner /TSST Corp DVDRW External
Honestly for a card under $100 bucks I don't think the power supply will be much of a factor. Yeah 250w is low (450-550 would be better) but a cheap card under 100 bucks shouldn't strain the ps.