Crank up the power with NVIDIA® GeForce® 7950 graphics processing units (GPUs).

GeForce 7950 GX2 Equipped with high-speed DDR3, users can fully exploit innovative graphics technologies such as NVIDIA® CineFX™ 4.0 engine, nView™, UltraShadow™ II technologies from NVIDIA™, it is also HDCP ready to support future HDCP protected audio/video contents, provide worry-free upgrade to the coming high-definition contents and many other premium graphics features.

The GX2 is armed with one Gigabyte of gDDR3 memory, more precisely 2x512MB and I say this specifically as "2x" memory is cloned (split in two) in SLI mode and thus effectively is 512Mb of memory per GPU. This memory is running at a 600 MHz memory clock frequency so its DDR will effectively serve you a 1200 MHz memory frequency, which again is a lot (400 MHz) slower than big poppa GTX 512MB. The outcome is a framebuffer bandwidth of 38.4 GB per second per GPU.
For a better comparison with previous products :

NVIDIA GeForce 6 & 7 Product Lineup Specifications
Product Name	# pixel processors	# vertex processors	Bus width	Memory Type/Amount	GPU Speed	RAM Speed
XFX 7900 GT2 XXX	24(x2)	8x2	256-bit	GDDR3/512MB (x2)	570MHz	1550 MHz
GeForce 7900 GT2	24(x2)	8x2	256-bit	GDDR3/512MB (x2)	500MHz	1200 MHz
GeForce 7900 GTX	24	8	256-bit	GDDR3/512MB	650MHz	1600 MHz
GeForce 7900 GT	24	8	256-bit	GDDR3/256MB	450MHz	1320 MHz
GeForce 7800 GTX	24	8	256-bit	GDDR3/512MB	560MHz	1600 MHz
GeForce 7800 GTX	24	8	256-bit	GDDR3/256MB	430MHz	1200MHz
GeForce 7800 GT	20	7	256-bit	GDDR3/256MB	400MHz	1000MHz
GeForce 7800 GS	16	6	256-bit	GDDR3/256MB	375MHz	1200MHz
GeForce 7600 GT	12	5	128-bit	GDDR3/256MB	560MHz	1400MHz
GeForce 7600 GS	12	5	128-bit	GDDR2/256MB	500MHz	1400MHz
GeForce 7600 GS	12	5	128-bit	GDDR2/256MB	400MHz	800MHz
GeForce 6800 Ultra	16	6	256-bit	GDDR3/256MB	400MHz	1100MHz
GeForce 6800 GT	16	6	256-bit	GDDR3/256MB	350MHz	1000MHz
GeForce 6800 GS PCX	12	5	256-bit	GDDR3/128/256MB	425MHz	1000MHz
GeForce 6800 GS AGP	12	5	256-bit	GDDR3/128/256MB	350MHz	1000MHz
GeForce 6800	12	5	256-bit	GDDR/128MB	325MHz	700MHz
GeForce 6800 LE	8	4	256-bit	GDDR/128MB	320MHz	700MHz
GeForce 6600 GT	8	3	128-bit	GDDR3/128/256MB	500MHz	1000MHz
GeForce 6600	8	3	128-bit	GDDR/128MB	300MHz	275(550)
GeForce 6200	4	3	64/128-bit	GDDR/128MB/256MB	300MHz	275(550)