ICH7 refers to the model of the south bridge chip, ICH7 and ICH7R are two chips, the latter has more raid support G31 and G35 single-finger north bridge chip model, ICH8R more than ICH8 RAID, the same is not a chip, north bridge to north bridge, south bridge to south bridge, can be freely collocation, G35 can also be equipped with ICH7. ICH7, is the Southbridge chip, INTER Southbridge chip series is ICH7,ICH8,ICH9, ICH10 and now the latest is ICH10, after R, refers to support RAID,I am not an expert, that's all I know. Hope it helps. ICH7 is the Southbridge chip. The ICH7R is an improved version of the ICH7. ICH8 did not release ICH8R, but it may be released in the future.