On Mon, May 24, 2010 at 3:05 PM, Alex Deucher <[email protected]> wrote: > On Mon, May 24, 2010 at 2:55 PM, Toan <[email protected]> wrote: >> Hi >> >> I have a ASUS M2V-HDMI motherboard with internal ATI Xpress 1250, >> and a PCI-E ATI X1650 PRO card. I use it as Home Theater System >> with XBMC software. I use Ubuntu 10.04, with xorg-edger PPA >> repository. >> >> If I use the Xpress 1250 graphic card, XBMC is very slow (~10-15 fps). >> On the other hand, XBMC on ATI X1650 PRO gives 70-90 fps. FPS for >> glxgears, however, are quite similar on both). >> >> For obvious reasons (less noise, less power consumption, direct HDMI >> output), I prefer to use the internal Xpress 1250 card if possible. >> I don't know if I setup it wrong (wrong options,....) or is it because >> of the open source radeon driver is much better for X1650 than X1250 >> at the moment. If anyone could help me with this, i'll greatly >> appreciate it. I'd happy to send you all the logs, .... > > The x1250 (r4xx-based 3D) and x1650 (r5xx-based 3D) have very similar > 3D engines. Most likely XBMC is making heavy use of vertex shaders. > The x1250 does not have vertex shader hardware while the x1650 does. > A better software vertex shader compiler can make big difference. > Eventually you'll see better performance once the r300 gallium driver > takes advantage of the llvm vertex shader work. >
Thanks. That's good to know. For the moment, I guess I'll stick with Enna Media Center instead of XBMC (I still don't want to use X1650 PRO) and wait for the newer r300 gallium driver. _______________________________________________ xorg-driver-ati mailing list [email protected] http://lists.x.org/mailman/listinfo/xorg-driver-ati
