A Radeon 9550 is a fairly new introduction and basically uses a lower clocked Radeon 9600 core.
The 9550 is a 4X/8X (1.5V/0.8V) card, not 3.3Volt which is the much older AGP 2X standard.http://www.ati.com/products/radeon9550/specs.html
Also this motherboard is installed with an 8X AGP slot (0.8V) so I'm not sure where you are getting your information from?
The main features of Foxxonn WinFast 760GXK8MB are:
Chipset: SiS 760GX (AGP 8x, ATA-133)
Super I/O: ITE IT8705F
Parallel IDE: Two ATA-133 ports.
Serial IDE: Two SATA-150 ports.
USB: Eight USB 2.0 ports, four welded directly on the motherboard and four available thru an I/O bracket.
FireWire (IEEE 1394): None (it’s optional, however).
On-board Audio: Produced by the chipset together with the codec Realtek ALC655 (six channels, 16-bit resolution, 90 dB signal-to-noise ratio).
On board Video: Yes, produced by the chipset (Mirage 2 graphics engine).
On-board LAN: Yes, Fast Ethernet (100 Mbps) produced by the chipset together with the Realtek RTL8201BL chip.
Power Supply: ATX12V.
Slots: 1 AGP 8x slot and 3 PCI slots.
Memory: 2 DDR-DIMM sockets (up to 2 GB up to DDR400/PC3200).
Number of CDs that come with this motherboard: 1 CD
Softwares that come with this motherboard: Norton Internet Security 2004.
Extra features: None.
More Information: http://www.foxconnchannel.com/products_motherboard_2.cfm?pName=760GXK8MB-RS
ATI’s RADEON 9550 is down-clocked RADEON 9600 featuring 128MB of DDR SDRAM memory with 128-bit bus,Graphics cards based on the RADEON 9550 will work at 250MHz/400MHz speeds for chip/memory, 75MHz below core clock-speed provided by the RADEON 9600, All graphics cards based on the RADEON 9550 and RADEON 9600-series VPUs are based on processors code-named RV350 and RV360. From architectural stand-point these two chips are same and feature 4 pixel and 2 vertex pipelines, but the RV360 is made using more advanced 0.13 micron low-k fabrication technology.
ATI and its add-in card partners would offer 6 solutions based on the RV350/RV360 chips with different clock-speeds, but the same DirectX 9.0 capabilities:
RADEON 9600 XT – 500MHz visual processing unit, 128MB/256MB 600MHz memory with 128-bit bus;
RADEON 9600 PRO – 400MHz visual processing unit, 128MB/256MB 600MHz memory with 128-bit bus;
RADEON 9600 – 325MHz visual processing unit, 128MB 400MHz memory with 128-bit bus;
RADEON 9550 – 250MHz visual processing unit, 128MB 400MHz memory with 128-bit bus;
RADEON 9600 SE – 325MHz visual processing unit, 128MB 400MHz memory with 64-bit bus.
RADEON 9550 SE – 250MHz visual processing unit, 128MB 400MHz memory with 64-bit bus;
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