The highly anticipated AMD Radeon HD 7790 arrived on March 22 (read our review here) and since then we've seen a deluge of variants released from a wide range of manufacturers. Based upon the releases consolidated in the table below, the HD 7790 will be either released at stock specifications (excepting cooler designs) or with very minimal factory overclocks.

Specifically with regards to the quantity of on-board memory, we can speculate that this seems to be intended to prevent the graphics card from outperforming the more expensive Radeon HD 7850.