Pci express 2.1 compatible with 2.0?

[crazypotatos]

Hi,
My brother plays minecraft with our old PC. And it runs horribly. Literally like 10-15 fps. Its a pentium 4 2.4ghz, no graphics card, 1 gb mem, and only pci 1 slots.
I was looking at making a new system for him (around or below $300).
AMD card obviously for the low cost.
Motherboard I was looking at: http://www.newegg.com/Product/Product.aspx?Item=N82E16813138376&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

graphics card: http://www.newegg.com/Product/Product.aspx?Item=N82E16814125430

So the graphics card is 2.1 pci express, and the motherboard has 2.0. Is it still compatible?

Also any other suggestions for this build if you could?

 

[ACTechy]

Yes, all PCI-E components are backwards/forwards compatible. It can limit the bandwidth ever so slightly, but nothing you'd pick up on.

Cheers

 

[crazypotatos]

thank you

 

[AMD Radeon]

well, it is the cheapest build i can do for your need

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Pentium G3220 3.0GHz Dual-Core Processor ($69.98 @ SuperBiiz)
Motherboard: MSI B85M-P33 Micro ATX LGA1150 Motherboard ($59.24 @ Amazon)
Memory: A-Data Gaming Series 4GB (2 x 2GB) DDR3-1600 Memory ($34.99 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($58.98 @ Outlet PC)
Video Card: PowerColor Radeon HD 7770 GHz Edition 1GB Video Card ($79.99 @ Newegg)
Case: Rosewill RANGER-M MicroATX Mini Tower Case ($39.98 @ Outlet PC)
Power Supply: Corsair CX 430W 80 PLUS Bronze Certified ATX12V Power Supply ($34.99 @ Microcenter)
Total: $378.15
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-28 12:10 EDT-0400)