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Qimonda already shipping GDDR5

What happened to GDDR4?!
| RAM News | Posted: Nov 5, 2007 11:55 pm

Though GDDR4 based memory hasn't even fully bedded itself into the market just yet, global memory supplier "Qimonda" have already shipped out the industry's first batch of 512MB GDDR5 samples to partners and customers.


The Joint Electron Device Engineering Council (JEDEC) has not solidified the standards for GDDR5. However, JEDEC's GDDR5 special interest group is in its second year of operation, and finalized specifications may come sooner than later.


Now it's just a question of how long we wait before seeing GDDR5 implemented on high-end graphics cards. To learn more about the benefits of GDDR5 Dailytech have the full rundown here folks.


GDDR5 features data rates at 20GByte/s per component. This is double the bandwidth of the fastest GDDR3 memory.


GDDR5 operates using two different clock types. One clock type that GDDR5 comes with is a differential clock (CK), where address and command inputs are referenced. The other clock type that GDDR5 uses is the forwarded differential write clock (WCK), which operates at twice the frequency of the CK. Read and write data are referenced to the WCK. Each write clock of GDDR5 SGRAM is assigned to two bytes.


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