790FX
Codenamed RD790, final name revealed to be "AMD 790FX chipset" [9]
Dual-socket (Quad FX, Dual Socket Direct Connect (DSDC) Architecture) or single AMD processor configuration
Maximum four physical PCI-E x16 slots and discrete PCI-E x4 slot [10], the chipset provides a total of 42 lanes solely in the Northbridge
HyperTransport 3.0 with support for HTX slots [10] and PCI Express 2.0
ATI CrossFire X
AutoXpress
AMD OverDrive
Energy efficient Northbridge design
65 nm CMOS fabrication process manufactured by TSMC
Extreme overclocking, reported to have achieved about 420 MHz bus for overclocking an Athlon 64 FX-62 processor [11], from originally 200 MHz.
Optional discrete chipset cache memory of at least 16 KB to reduce the latencies and increase the bandwidth [10]
Supports Dual Gigabit Ethernet, and teaming option [10]
Reference board codenamed "Wahoo" [12] for dual-processor system reference design board with three physical PCI-E x16 slots, and "HammerHead" for single-socket system reference design board with four physical PCI-E x16 slots, also notable was the reference boards includes two ATA ports and only four SATA 3.0 Gbit/s ports (as being paired with SB600 southbridge).
Will pair with SB750 southbridge with support up to six SATA ports and enhanced Phenom processors overclocking via ACC functionality, and will later support Socket AM3 with DDR3 SDRAM support in the first quarter of 2009.
Enthusiast discrete multi-graphics segment
790GX
Codenamed RS780D [6], final name seen on internal AMD presentation [15]
Single AMD processor configuration
Integrated graphics: Radeon HD 3300 [16]
ATI Hybrid Graphics
Side-port memory as local frame buffer [17], supporting DDR2 and GDDR3 modules. [18]
ATI PowerPlay technology
Two physical PCI-E x16 slots at x8 bandwidth [6]
HyperTransport 3.0 and PCI Express 2.0
ATI CrossFire
Hybrid CrossFire X
AMD OverDrive
Energy efficient Northbridge design
55 nm CMOS fabrication process manufactured by TSMC
528-pin Flip Chip Ball Grid Array (FCBGA) package
Performance hybrid multi-graphics segment
Biggest difference: 790GX has onboard GPU while 790GX doesn't. not sure but 790FX support x16 crossfire setup where as for 790GX it is x8 crossfire