Phoronix posted a review on the MSI GeForce 9800GT 512MB running under Linux

For Linux desktop users interested in a mid-range discrete graphics card there are more choices than ever before with NVIDIA continuing to release new stable Linux drivers as they have done for many years while AMD this year has been making evolutionary leaps compared to their earlier state. AMD is now providing same-day support with all new products, CrossFire on Linux, OverDrive, and many other recently introduced features. NVIDIA and AMD are nearly at a feature parity and even in the past two months they both released new video APIs for Linux (PureVideo / VDPAU and X-Video Bitstream Acceleration, respectively) and they are now battling it out on Linux over performance. We recently looked at AMD's new ATI Radeon HD 4830 mid-range graphics card, but in this article we are comparing it to the NVIDIA GeForce 9800GT, courtesy of Micro-Star International.

MSI GeForce 9800GT 512MB Review