Tuesday, May 5th 2009
GT300 to Boast Around 256 GB/s Memory Bandwidth
Recently, early-information on NVIDIA's next-generation GT300 graphics processor surfaced, that suggested it to pack 512 shader processors, and an enhanced processing model. A fresh report from Hardware-Infos sheds some light on its memory interface, revealing it to be stronger than that of any production GPU. According to a piece of information that has been doing ping-pong between Hardware-Infos and Bright Side of News, GT300 might feature a 512-bit wide GDDR5 memory interface.
The memory interface in conjunction with the use of the lowest latency GDDR5 memory available, at a theoretical 1000 MHz (2000 MHz DDR) would churn out 256 GB/s of bandwidth, the highest for a GPU so far. Although Hardware-Infos puts the lowest-latency figure at 0.5 ns, the math wouldn't work out. At 0.5 ns, memory with actual clock rate of 1000 MHz would churn out 512 GB/s, so a slight inaccuracy there. Qimonda's IDGV1G-05A1F1C-40X leads production today with its "40X" rating. With these chips across a 512-bit interface, the 256 GB/s bandwidth equation is satisfied. The clock speeds of the memory isn't known just as yet, the above is just an example that uses the commonly available high-performance GDDR5 memory chip. The new GPU, at least from these little information leaks, is shaping up to be another silicon-monstrosity by NVIDIA in the making.
Source:
Hardware-Infos
The memory interface in conjunction with the use of the lowest latency GDDR5 memory available, at a theoretical 1000 MHz (2000 MHz DDR) would churn out 256 GB/s of bandwidth, the highest for a GPU so far. Although Hardware-Infos puts the lowest-latency figure at 0.5 ns, the math wouldn't work out. At 0.5 ns, memory with actual clock rate of 1000 MHz would churn out 512 GB/s, so a slight inaccuracy there. Qimonda's IDGV1G-05A1F1C-40X leads production today with its "40X" rating. With these chips across a 512-bit interface, the 256 GB/s bandwidth equation is satisfied. The clock speeds of the memory isn't known just as yet, the above is just an example that uses the commonly available high-performance GDDR5 memory chip. The new GPU, at least from these little information leaks, is shaping up to be another silicon-monstrosity by NVIDIA in the making.
106 Comments on GT300 to Boast Around 256 GB/s Memory Bandwidth
Can't wait to see what AMD's response is to this beast.
At least from what I've been told.
Edit: Wasn't quite right but according to wikipedia "GDDR5 is the successor to GDDR4 and unlike its predecessors has two parallel DQ links which provide doubled I/O throughput when compared to GDDR4"
So shouldn't it be easier to put 4GHz effective in the article as people are used to saying that, rather than getting somebody confused.
Anyway, I didn't get you point that. So does GDDR5 push 4GHz or 2GHz ?
So does higher mem bandwidth = better memory overclock?
People have freaking 1200 watt psu's.
That is not cool, this thing better now use more power than currnet cards.
Take for example the 275 line up from Evga, the standard edition vs the FTW edition. Both are same gpu's, both are same memory modules, but the FTW edition is clocked faster and has a slightly higher memory bandwidth. Wouldn't the higher bandwidth mean the FTW edition preforms better than the regular edition overclocked to the same clock settings? I'm trying to clarify to see if the extra $ for a higher memory bandwidth will pay off.