Type	Radeon X700 Pro	Radeon X700 XT	Radeon X800 Pro	Radeon X800 XL	Radeon X800 XT	Radeon X800 XT	Radeon X800 XT Platinum Edition	Radeon X850 XT	Radeon X850 XT Platinum Edition
codename	RV410	RV410	R420	R430	R420	R423	R423	R480	R480
Interface	PCI-Express x16	PCI-Express x16	AGP	PCI-Express x16	AGP	PCI-Express x16	AGP/PCI-Express x16	PCI-Express x16	PCI-Express x16
Frame Buffer	256 MB	256 MB	256 MB	256 MB	256 MB	256 MB	256 MB	256 MB	256 MB
Core Freq	425 MHz	475 MHz	475 MHz	400 MHz	500 MHz	500 MHz	520 MHz	520 MHz	540 MHz
Memory Freq	433 MHz	525 MHz	450 MHz	500 MHz	500 MHz	500 MHz	560 MHz	540 MHz	590 MHz
Memory Controller	128 bit	128 bit	256 bit	256 bit	256 bit	256 bit	256 bit	256 bit	256 bit
Memory type	GDDR3	GDDR3	GDDR3	GDDR3	GDDR3	GDDR3	GDDR3	GDDR3	GDDR3
DirectX	9.0	9.0	9.0	9.0	9.0	9.0	9.0	9.0	9.0
Vertex Shaders	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0
Pixel Shaders	2.0b	2.0b	2.0b	2.0b	2.0b	2.0b	2.0b	2.0b	2.0b
Vertex Shader Pipes	6	6	6	6	6	6	6	6	6
Pixel Shader Pipes	8	8	12	16	16	16	16	16	16
Extra Power-connector	-	-	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Chip - Transistors	120 mln	120 mln	160 mln	160 mln	160 mln	160 mln	160 mln	160 mln	160 mln
Chip - Fab Process	110 nm	110 nm	130 nm	110 nm	130 nm	130 nm	130 nm	130 nm	130 nm

Right then, the data above is showing standard reference clock-speeds as suggested by ATI. As you probably have noticed the standard x850 XT model (if you can call it standard) is allowed to run at PE speeds with a 540 MHz core and 1.18 GHz clocked memory thanks to the included iTurbo software. So why would you chip in another 50 bucks for the PE edition? Well the PE edition is clocked standard at 540 MHz and our findings show that it can in fact can be clocked a little higher than the standard XT version. Will you ever notice the difference in games? I doubt it. Therefore I definitely recommend the standard XT version over the more expensive platinum edition. But the high-end enthusiast will probably go for the PE version anyway as it was tested to clock a little higher then rest. Furthermore, 100% same product.