I did a research in ACER sites in Europe and I discoverd that ACER has the 5672 with ATI X1600 256 MB dedicated but with a 1,66 CPU. In Sweden and Norway there are these models :
Windows® XP Home Edition Intel Centrino Duo T2300 1.66GHz processor, 15.4" WXGA CrystalBrite 16ms, 120GB 5400rpm, 1024MB (2*512) DDRII, DVD Super Multi (slot),
ATI X1600, 128MB/256 Hypermemory, WLan a/b/g, Bluetooth, 1.3MP kamera, VoIP Bluetooth telefon
Windows® XP Home Edition , Intel Centrino Duo T2600 2.16GHz processor, 15.4" WXGA CB 16ms,
ATI X1600 256MB/512MB Hypermemory, 2048MB (2*1024) DDR2, 120GB 5400rpm S-ATA, HD DVD drive, 802.11a/b/g, Bluetooth, 1.3MP Orbi kamera
Unless they mean ATI can go to 256 or 512MB as a hypermemory card. I can't be sure with ACER.
ACER Sweden
ACER gives different models in different countries and we cannot find what we want

WHY?????