The Most Comprehensive AMD Radeon Linux Graphics Comparison

Radeon X1800XT: The Sapphire ATI Radeon X1800XT 256MB, which also is an R520 part at 625MHz and 256MB of GDDR3 video memory at 1500MHz. This is actually the graphics card I used when for 30 days writing the "ATI Redblog" in the earlier Phoronix days, for those who remember. There is not much more to point out about the open-source R500 Linux support or the now-defunct Catalyst Linux support.

Radeon X1950PRO: The X1950PRO was released later in 2006 with the RV570 core and introduced the second-generation CrossFire. This particular Radeon X1950PRO comes from ASUS and boasts a 580MHz RV570 core and 1400MHz GDDR3 video memory with a 256MB capacity.