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Hardware > Video-cards XpertVision Radeon X850 XT Homepage: Specification

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XpertVision Radeon X850 XT

Mark: Very good

I now have a X850XT from XpertVision. http://www.xpertvision.de/v2/index.php?option=com_content&task=view&id=53&Itemid=67

I just want to share my experiences with this card but also have a few questions.

First of all, the card works great with SNAP 3.1.8 and CRT. I simply swapped the cards and the new one was detected fine. I only had to reprogram my custom resolution (1456x1100x32). AGP 8x, fastwrite and full accel are enabled without any issues so far.

There are only 2 unclear things:

• Only 128MB of the 256MB are reported. Is this related to the fact I set AGP aperture size in BIOS to 128MB? graphics.log does not report any issues with VIRTUALADDRESSLIMIT=1536.
• The memory clock is reported by gamemclk as: Memory clock settings for ATI Radeon X850 Series (device 0):

     Default: 400.00 MHz
     Current: 400.00 MHz
     Maximum: 0.00 MHz
  

  According to the ATI driver on Windows XP it should be at 540 MHz. The GPU core frequency is reported as 520 MHz by the Windows driver. gamemclk refuses to accept any value. Further more the maximum frequency does not match the one written to graphics.log:

     Graphics device configuration:
       Manufacturer......... ATI
       Chipset.............. Radeon X850 Series
       Bus Type............. AGP bus
       Memory............... 131072 KB
       DAC.................. ATI Internal 24 bit DAC
       Clock................ ATI Internal Clock
       Memory Clock......... 400 MHz
       Default Memory Clock. 400 MHz
       Maximum Memory Clock. 400 MHz
       Driver Revision...... 3.2, Build 29
       Driver Build......... Sep 25 2006
       Certified Version.... 1.60
       Certified Date....... Sep 25 2006
  

  In terms of performance on eCS on my So754 Athlon64 3000+ (VIA K8T800 chipset) I had expected somewhat bigger improvements compared to the Radeon 9600XT. Only the on-chip operations BitBlt S->S, Filled Rectangle, Pattern Fill, Vertical Lines and Horizontal Lines (Sysbench 0.95) show improvements of about 25 percent. Everything else and also DIVE speed has not changed. Because of the much faster memory interface I had expected some changes here. Could this be related to the 400MHz memory clock issue? The video bus bandwidth is at 1004 MB/sec.

  On Windows XP the performance is superior just as expected. In 3DMark2003 (didn't want to download the huge newer ones) I get a rating of 11728 (medium quality settings) compared to 4401 on the 9600XT (reduced quality settings) when running the default benchmark.

  Analog signal quality is the same as on the 9600XT. At 1456x1100 with 85Hz on my 19" CRT the 9.WarpSans font on the desktop is crisp and not washed out.

OS/2 applications I tested so far are WarpVision with SNAP overlay, BTTV, SeaMonkey, PMView Pro and several others. In PMView Pro the jaggies when resizing the selection area are still there. All other apps work as expected and appear to be a bit more snappier ;) .

Information is sent by: Heiko Nitzsche -- 2006-12-02 17:41:50

[GoogleAdv]

Comments:

Eugene Gorbunoff 2009-05-22 20:27:23

Heiko Nitzsche: I have a ATI X850XT with 2 CRTs connected running at 2980x1100x32bpp with Sub-D and even with Sub-D the image quality is similar to my old Matrox G400. But performance has dramatically increased, so don't stuck at the old Matrox! Even my old ATI 9600XT was several times faster than the G400.

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