Adata's DDR4 memory modules are coming to shelves soon.
Adata's DDR4 Memory Modules Are Finally Arriving : Read more
Adata's DDR4 Memory Modules Are Finally Arriving : Read more
2133-15 DDR4 when there is 2133-9 DDR3 @ 1.5V on the market... not convinced those DDR4 DIMMs will be a hit with the X99 crowd that is not exactly known for caring about saving 3-5W - particularly if it comes with any sort of performance penalty like the 66% higher latency on DDR4 would.
Well, the DDR4 transition has to start somewhere... even if the starting point seems to make little to no sense.
zfreak280 :I hope you do realize that 2133-15 DDR4 is faster than 2133-9 DDR3.
15 cycles latency / 1066MHz clock = 14ns latency for DDR4
9 cycles / 1066MHz clock = 8.4ns latency for DDR3
That makes DDR3 40% faster on first-word latency. Bandwidth is the same since both are the same width and same data rate.
You cannot calculate the real performance loss (bacause nowadays there is no gain) because even if it's an Haswell architecture the ram controller may behave differently. I think the performance penalty is more mathematical than real world experience, but it's there. We have not yet seen what Vpp boost does so the first word access latency could be addressed in this way. So we cannot really compare DDR3 with DDR4 because they work differently and hopefully much better with the latest having an advantage even with NAND chips apparently weaker.2133-15 DDR4 when there is 2133-9 DDR3 @ 1.5V on the market... not convinced those DDR4 DIMMs will be a hit with the X99 crowd that is not exactly known for caring about saving 3-5W - particularly if it comes with any sort of performance penalty like the 66% higher latency on DDR4 would.
Well, the DDR4 transition has to start somewhere... even if the starting point seems to make little to no sense.
I hope you do realize that 2133-15 DDR4 will not have a 66% performance penalty over 2133-9 DDR3.
zfreak280 :I hope you do realize that 2133-15 DDR4 is faster than 2133-9 DDR3.
15 cycles latency / 1066MHz clock = 14ns latency for DDR4
9 cycles / 1066MHz clock = 8.4ns latency for DDR3
That makes DDR3 40% faster on first-word latency. Bandwidth is the same since both are the same width and same data rate.
You cannot calculate the real performance loss (bacause nowadays there is no gain) because even if it's an Haswell architecture the ram controller may behave differently. I think the performance penalty is more mathematical than real world experience, but it's there. We have not yet seen what Vpp boost does so the first word access latency could be addressed in this way. So we cannot really compare DDR3 with DDR4 because they work differently and hopefully much better with the latest having an advantage even with NAND chips apparently weaker.2133-15 DDR4 when there is 2133-9 DDR3 @ 1.5V on the market... not convinced those DDR4 DIMMs will be a hit with the X99 crowd that is not exactly known for caring about saving 3-5W - particularly if it comes with any sort of performance penalty like the 66% higher latency on DDR4 would.
Well, the DDR4 transition has to start somewhere... even if the starting point seems to make little to no sense.
I hope you do realize that 2133-15 DDR4 will not have a 66% performance penalty over 2133-9 DDR3.