lite can not find all of the memory of HD6950 (1G)

[perlish]

My HD6950 has 1G memory,the plus can find all of them ,but lite can only find half of them.

OS:ubuntu 11.10 64bit
driver:amd-driver-installer-12-4-x86.x86_64.run

oclHashcat-lite v0.9 by atom starting...

GPU-Loops: 256
GPU-Accel: 160
Password lengths range: 1 - 55
Platform: AMD compatible platform found
Watchdog: Temperature limit set to 90c
Device #1: Cayman, 512MB, 0Mhz, 22MCU
Device #2: Cayman, 512MB, 0Mhz, 22MCU
Device #3: Cayman, 512MB, 0Mhz, 22MCU


oclHashcat-plus v0.08 by atom starting...

Hashes: 2
Unique digests: 1
Bitmaps: 8 bits, 256 entries, 0x000000ff mask, 1024 bytes
GPU-Loops: 1024
GPU-Accel: 160
Password lengths range: 1 - 7
Platform: AMD compatible platform found
Watchdog: Temperature limit disabled
Device #1: Cayman, 1024MB, 0Mhz, 22MCU
Device #2: Cayman, 1024MB, 0Mhz, 22MCU
Device #3: Cayman, 1024MB, 0Mhz, 22MCU