I have this Club3D Radeon 9600
And I really wanted to run it on AGP2x on an Intel 440BX.
In addition, this post contained schematic diagrams.
Re: For all you Radeon ATi RV350/RV280 R9200 / 9200SE/ 9250 /9550 /R9550 / R9600 /9600 /9600XT lovers DX9 , schematic h

I made a cut in the AGP, added a transistor Q2 and resistors for the AGP_test signal.
And... nothing.
The card is not detected in 440BX.
It does not burn out, does not stink, does not heat up - it is simply not detected.
The card continues to work perfectly with I815 at AGP 4x/2x (signaling 1.5 V). And it is not detected in it if you force AGP2x (3.3 V) by removing resistor R19 (AGP_TYPEDET#)

Changes in the AGPFBSKEW(1:0) and X1CLK_SKWE(1:0) straps like 9200 and 9600 only worsen the stability of the AGP on the i815.
BUSCFG(2:0) - in the same position as the of universal AGP 2/4/8 cards, for example 9200/9800.

Any ideas?