AMD integrated graphics?

Okay im buying a computer in fact it's a: lenovo IdeaCentre H405 (7723-1CU) Desktop PC Athlon II X4 645(3.1GHz) 4GB DDR3 1TB HDD Capacity ATI Radeon 3000 graphics Windows 7 Home Premium 64 bit. And it said ATI radeon 3000 integrated graphics I wanted to know if this was a good graphics card and if I could change it later and also If I could run Arma 2 on high or very high graphics with it. Thanks in advance!

I doubt that it could run that game all on low at playable frame rates. It is passable for older games and general purpose use, but if you want your games to be playable you're going to have to add in video card.

what about this HP Pavilion P6649C (BT591AAR#ABA) Refurbished Desktop PC Athlon II X4 635(2.9GHz) 6GB DDR3 1TB HDD Capacity ATI Radeon HD 4200 Windows 7 Home Premium 64-bit

Pretty much the same thing. The HD 4200 is just a slightly updated version of the HD 3200; DirectX 10.1 instead of DirectX 10, and slightly faster overall. Still going to end up about the same though with a game like ARMA 2, basically unplayable. To give an idea as to what to look for,

Armed Assault 2: Graphics card benchmarks and visual quality compared [Top article of June 2009] - Armed Assault 2, ArmA2, Benchmarks, graphics, comparisons - PC Games Hardware

The HD 4200/3000 would probably be about half of the bottom card (HD3870), and that graph is at normal settings. High or very high would be nothing more than a slideshow.

You want to play a game like that you're looking at an extra $150.00 to $200.00 for a video card, and with either of those computers you're also looking at a new power supply as what comes in most appliance computers just isn't up to running a decent video card as well as the rest of the computer.

what about this computer:Lenovo - IdeaCentre Desktop / Intel® Core™ i7 Processor / 8GB Memory / 1TB Hard Drive. With these specs?
From our expanded online assortment; not available in all Best Buy stores
Intel® Core™ i7-2600 processor
Features an 8MB cache and 3.4GHz processor speed.Intel® Core™ i7 processor
Features 8-way processing for ultimate smart performance. Intel® Turbo Boost Technology automatically speeds up your processor when your PC needs extra performance.8GB DDR3 SDRAM
For multitasking power, expandable to 16GB.Multiformat DVD±RW/CD-RW drive
Create custom DVDs and CDs.1TB Serial ATA hard drive (7200 rpm)
Offers spacious storage and fast read/write times.NVIDIA GeForce GT 420 graphics
Feature up to 1GB video memory for lush images.14-in-1 media reader
Supports Memory Stick, Memory Stick PRO, Memory Stick Duo, Memory Stick PRO Duo, Secure Digital, Secure Digital High Capacity, miniSD, miniSDHC, CompactFlash and Microdrive formats.Also supports MultiMediaCard, MultiMediaCard Plus, MultiMediaCard mobile and Reduced-Size MultiMediaCard formats.
8 USB 2.0 ports
For fast digital data transfer and easy peripheral connectivity.Built-in Gigabit Ethernet LAN
For quick and easy wired Web connection.Microsoft Windows 7 Home Premium Edition 64-bit operating system preinstalled
Provides a stable platform for word processing, Web navigation, gaming, media storage and more.Intel, Pentium, Celeron, Centrino, Core, Viiv, Intel Inside and the Intel Inside logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States and other countries.

also is that a good deal for 1000 dollars?