All Questions
14
questions
1
vote
1
answer
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Expected results of a stream memory bandwidth benchmark
I recently built a Threadripper system and ran the stream memory bandwidth benchmark on it. The results are much lower than the theoretical bandwidth of the system, and I am not sure if these transfer ...
- 15
1
vote
1
answer
238
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Is it possible to saturate the memory bus using high frequency DDR4 memory, even if a motherboard claims support for it?
So a friend of mine asked for some DDR4 memory recommendations since he was still using DDR3 and wanted to buy a new motherboard, preferably B450 chipset so he could buy a Ryzen. I told him to buy a ...
- 13
0
votes
2
answers
527
views
Should cpu memory bandwidth match with video memory bandwidth?
I found somewhere that the video memory bandwidth is a good indicator of performance on video cards. I checked a few examples and it correlates pretty well with benchmark points.
I read in another ...
- 1,145
21
votes
3
answers
39k
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What's the difference between GPU Memory bandwidth and speed?
I was looking at Nvidia's series 10 graphics cards' specs and noticed they have memory speed and memory bandwidth specified. Memory speed is expressed in Gbps and memory bandwidth is expressed in GB/...
- 343
0
votes
0
answers
216
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Intel Xeon E5-2698 v3 with quad memory channels, what should be the real expected memory bandwidth?
I suppose this question could be made more general to cover all cpus that make use of multi-channel memory, but what I'm trying to determine is how exactly the multi-channeling is done.
I've heard ...
- 645
0
votes
1
answer
176
views
Does DDR RAM also have a minimum bandwidth?
Reading about DDR3 on Wikipedia I can see that it has a peak data transfer rate. However, I assume the peak rate to be a theoretical maximum.
Can we also derive a minimum transfer rate for DDR3 RAM, ...
- 6,064
0
votes
1
answer
117
views
Xeon memory bandwidth specification incongruency
How can this Xeon achieve the stated 102 GB / s memory bandwidth with the following configuration:
Channels: 4
Type: DDR4-1866
The max. theoretical bandwidth would be 59.712 GB / s. The ...
- 155
1
vote
1
answer
1k
views
How to Match Memory to FSB (pre IMC)
I have the following hardware:
P35-DS3L supporting FSB 333/266/200 Mhz, quad-pumped. Four dual-channel slots.
E2180 currently @ 2.00Ghz (200.00x10)
I plan to raise the FSB to 266.66.
This is my ...
- 541
3
votes
1
answer
2k
views
Linux RAM throughput statistic for a given PID
How do I find out how fast is a certain process accessing the DRAM?
There are lots of ways to monitor the CPU usage, memory footprint etc etc, but is there a utility I can use to monitor the memory ...
- 146
0
votes
1
answer
74
views
Does using more memory slots equal better bandwidth?
I am thinking of buying a Mac Pro, and I am wondering about the various memory configurations. It can be had with 3x4GB, 4x4GB, 4x8GB or 4x16GB.
3x4GB seems like a weird configuration. I thought DDR ...
- 1,369
0
votes
3
answers
1k
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How to use full bandwidth available?
I'm working on a new kind of proxy server using node.js. With cluster module I'm able to fork the process (which are double the number of cores). The server configuration is 8GB RAM, 8 core Intel (...
- 88
5
votes
2
answers
13k
views
Why is writing speed for RAM less than reading speed? And how do caches come into the picture?
Firstly, this is true, right? I feel that reads will always be faster than writes, also this guy here does some experiments to "prove" it. He doesn't explain why, just mentions "caching issues". (and ...
- 153
1
vote
3
answers
2k
views
What drawbacks are there when using memory that is faster than what is rated by the motherboard?
With the Core i7 platform, memory speeds of up to 1600MHz are officially supported, but kits are sold with speeds of up to 2133MHz and beyond.
Are the caveats/drawbacks of using faster-than-rated ...
- 3,934
3
votes
1
answer
4k
views
How to measure memory bandwidth usage
I am trying to determine how close to being bandwidth-limited a code I have written is, so I was wondering whether there are any tools out there to determine memory bandwidth usage? The code I have is ...
- 1,767