GTS250 Work/Not Work

[skijumper]

Hi for all. Sorry for my English, i am from Czech.

I testing now MAC OS 10.5.2 (Kalyway), all is working but i have big problem with Graphic Card. Today i first set my graphic to normall 1280x1024 in boot.plist and with the aquamac.proboards.com/index.cgi?board=hack1&action=display&thread=509&page=1 GFX strings.

I have exact Leadtek WinFast GTS250 1024MB DDR3.

Now my graphic card working, but only with 1280x1024 without enabled changing resolution. In Info about MAC is this:

NVIDIA GeForce GTS 250:

Chipset Model: NVIDIA GeForce GTS 250
Type: Display
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 1024 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0615
Revision ID: 0x00a2
ROM Revision: 3172a
Displays:
Display:
Resolution: 1280 x 1024
Depth: 32-bit Color
Core Image: Software
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Not Supported
Display Connector:

But all is running slowly. Animations of switching applications, widgets, and video players (all) not working - only videos on YouTube at slow.

Can someone help me? Please please, thank all very much :-)