I don't know either.... It should at least be on par with a 7850 or 7870 but most 7870LE's perform worse than both the 7850 and 7870, all of which have a 256 bit memory bus. I think the timings on the LE's must be really high since their memory clock speed (potential) is very high. The high timings would definitely be the ones to blame if you ask me.
I had The Stilt mod my 7870 XT mod my cards bios, he said he improved the 1500 and 1250 timings, but it didn't help my card. maybe 5kh/s I don't know what the heck the problem is. I've gotten it up to 420 kh/s but that was usually a fluke and mines normally 360-380. It should be high 4's or even low 5's based on the hardware but who knows. I moved on and got a 290, and moved the 7870 to my wifes rig, mining at -I 12 -g 2. She can't even tell its mining, but it gets the same 360 kh/s.
