FYI: XBMC is slow on Xpress 1250, fast on X1650 PRO
alexdeucher at gmail.com
Mon May 24 12:05:56 PDT 2010
On Mon, May 24, 2010 at 2:55 PM, Toan <nguyenthetoan at gmail.com> wrote:
> 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
> 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.
More information about the xorg-driver-ati