Both the 1662 and 1661 use the same chipset. Link below is the article I found - mainly discussing the ATI 9100 IGP chipset.http://www.firingsquad.com/hardware/..._igp/page2.asp
Within the article a few comments on the 9000 chipset:
RADEON 9000 PRO IGP
For entry level value systems, today ATI has introduced the RADEON 9000 PRO IGP. While the name is a little different, the RADEON 9000 PRO IGP is built on the same fundamental architecture as the RADEON 9100 IGP, the chipset supports Intel’s 800MHz system bus as well as the older 533MHz bus just like the original RADEON 9100 IGP. ATI also uses the same integrated graphics core.
The sole change is found in the memory controller. Whereas the 9100 IGP and 9100 PRO IGP support dual-channel operation, the RADEON 9000 PRO IGP possess a single-channel interface. Because of this distinction, this chipset is intended to battle with Intel’s similarly outfitted 848P chipset, which also supports the latest Pentium 4 processors and memory technologies yet relies on a single-channel memory interface.
So, it indicates that the 9000 IGP chipset would support DDR 333 memory. The Intel chipset referenced, the Intel 848P, does support up to DDR333 SDRAM memory.
My only question is point is, (again, I'm not a techie) I'm trying to understand what the impact is on performance based on the 9000 chipset relying on a single-channel memory interface. May not mean much at all. I just don't know. Would like to know before I make a purchase decision.