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How would one benchmark memory performance (DRAM latency & bandwidth) on the various chips?
by AceJohnny2 6y ago
How would one benchmark memory performance (DRAM latency & bandwidth) on the various chips?
- spamizbad 6y agoAbove my pay grade! You probably operating with a fixed speed on M1 so you can't intentionally cripple it, but it would be interesting to see "What would this look like if Apple had paired it with standard DDR4-3200?". AMD's Zen core's are known to respond well to lower latency RAM, but in the PC space you're not getting anything close to what Apple has with the LPDDR4x on package. You could try benchmarking the Intel and Ryzen chips with DDR4 5000 and try carefully tuning the memory frequency and timing to find the right balance of bandwidth and latency.
- jeffbee 6y ago> in the PC space you're not getting anything close to what Apple has with the LPDDR4x on package. I mean, that's exactly how an 11th Gen Core laptop is constructed.
- kllrnohj 6y ago> but in the PC space you're not getting anything close to what Apple has with the LPDDR4x on package. You can run basically any Intel CPU at DDR4-4266 without any issue. Or you can go thread ripper and laugh in quad channel memory. Or Intel x299 and triple-channel memory. You don't have to tune anything, either, the RAM comes pre-tuned with the right timings in the XMP profile.
- 0x008 6y agoDDR5 is coming to consumer platforms probably 2022
- dpzmick 6y agothis is a reasonable test: https://www.cs.virginia.edu/stream/ref.html https://www.cs.virginia.edu/stream/ref.html but it's pretty straightforward to just copy giant buffers in order/out of order and squint really hard at the results