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Heh...Heh...Posted Jan 9, 2012 13:06 UTC (Mon) by etienne (subscriber, #25256)In reply to: Heh... by khim Parent article: Linux Mint introduces Cinnamon
> transfer only 25 million bytes from memory at the same second.
Wiki PCIe 2.0 bandwidth: per-lane throughput rises from 250 MB/s to 500 MB/s
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Yup. My mistake. Posted Jan 9, 2012 13:14 UTC (Mon) by khim (subscriber, #9252) [Link] Oops. I've actually looked on real tests but they were messed up (they had title "Memory Bandwidth, MB/s" and under that numbers between 20 and 25... now they are fixed and title says "Memory Bandwidth, MB/s" which of course makes a hell of difference). Yes, your calculation looks correct - this means that in the absence of GPU acceleration perspective effect should be coded very carefully to saturate PCIe.
Oops... Posted Jan 9, 2012 16:01 UTC (Mon) by khim (subscriber, #9252) [Link] Sorry for repeating the typo :-( "Memory Bandwidth, MB/s" was replaced with "Memory Bandwidth, GB/s"... Numbers are still between 20 and 25. For LGA 2011 CPUs it's between 40 and 45, but only if there are at least 6-8 threads working in parallel. For a single thread it's the same 20-25 GB/s.
Oops... Posted Jan 9, 2012 17:20 UTC (Mon) by etienne (subscriber, #25256) [Link]
25 Gbits/s / 8 = 3 Gbytes/s
screen definition of 1600x1200 in 32 bits = 7.3 Mbytes Maximum "total update" frequency: 3000 / 7 = 428 times/seconds.
That is obviously when you saturate the PCIe link, which may not be possible on PC.
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