Misreported VRAM

[Mike Lothian]

I have a Radeon 4650 (RV730) :

 01:00.0 VGA compatible controller [0300]: ATI Technologies Inc RV730
PRO [Radeon HD 4650] [1002:9498]

This should have 1GB DDR2 VRAM on board however my dmesg states differently

[drm] Initialized drm 1.1.0 20060810
[drm] radeon defaulting to kernel modesetting.
[drm] radeon kernel modesetting enabled.
radeon 0000:01:00.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
radeon 0000:01:00.0: setting latency timer to 64
[drm] radeon: Initializing kernel modesetting.
[drm] register mmio base: 0xFE9F0000
[drm] register mmio size: 65536
ATOM BIOS: 11X
[drm] Clocks initialized !
[drm] Detected VRAM RAM=256M, BAR=256M
[drm] RAM width 128bits DDR
[TTM] Zone  kernel: Available graphics memory: 1028846 kiB.
[drm] radeon: 256M of VRAM memory ready
[drm] radeon: 512M of GTT memory ready.
[drm] Loading RV730 CP Microcode
platform radeon_cp.0: firmware: using built-in firmware
radeon/RV730_pfp.bin
platform radeon_cp.0: firmware: using built-in firmware
radeon/RV730_me.bin
[drm] GART: num cpu pages 131072, num gpu pages 131072
[drm] ring test succeeded in 1 usecs
[drm] radeon: ib pool ready.
[drm] ib test succeeded in 0 usecs
[drm] Radeon Display Connectors
[drm] Connector 0:
[drm]   HDMI-A
[drm]   DDC: 0x7f10 0x7f10 0x7f14 0x7f14 0x7f18 0x7f18 0x7f1c 0x7f1c
[drm]   Encoders:
[drm]     DFP2: INTERNAL_UNIPHY1
[drm] Connector 1:
[drm]   VGA
[drm]   DDC: 0x7e20 0x7e20 0x7e24 0x7e24 0x7e28 0x7e28 0x7e2c 0x7e2c
[drm]   Encoders:
[drm]     CRT2: INTERNAL_KLDSCP_DAC2
[drm] Connector 2:
[drm]   DVI-I
[drm]   DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c
[drm]   Encoders:
[drm]     CRT1: INTERNAL_KLDSCP_DAC1
[drm]     DFP1: INTERNAL_UNIPHY
[drm] fb mappable at 0xD0141000
[drm] vram apper at 0xD0000000
[drm] size 8294400
[drm] fb depth is 24
[drm]    pitch is 7680

Is it perhaps reporting something else?

Cheers

Mike