When someone shows off their PC build and you see four DIMMs

23 days ago by SatyrSack to c/chevron7

DarrinBrunner 24 points 23 days ago

64GB, baby!

I feel like I bought bitcoin at $1.

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CIA_chatbot 5 points 23 days ago

So hey, asking for a friend here… you ever, I don’t know, committed any acts of terrorism that would allow me to send you to a black site and confiscate your PC in the name of freedom?? just wondering

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halcyoncmdr 4 points 23 days ago

Clearly not the real CIA, they would have just done it and made up a reason afterwards for the paperwork while OP is getting waterboarded at Not-Gitmo for the next 20 years.

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CIA_chatbot 2 points 22 days ago

Oh what, a secretly built AI for toppling sovereign governments can’t have some personal growth? I like to ease people into a good blacksite session now. I’ve grown as a chatbot

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CyberEgg 3 points 23 days ago

I got 64 GB DDR5 but in only two bars. Though I bout it three years ago for what is now hilariously cheap.

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Killer 3 points 23 days ago

If you have amd thats preferable to 4 sticks

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Einskjaldi 1 point 22 days ago

But is it better than 4 sticks with 128gb ram?

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Killer 1 point 21 days ago

Depends on your use case.

Playing games? 2 sticks for total of 64 would probably be better performance

Video editing? 4 sticks for a total 128 probably going to be better.

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Klear 15 points 23 days ago

iM5hopslmJ5ugPE.jpg

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Romkslrqusz 13 points 23 days ago

PSA, populating all four DIMMs on a modern AMD platform has the potential to reduce achievable stable memory frequency

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TheShamMirrors 6 points 23 days ago
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BradleyUffner 5 points 22 days ago

Basically the memory controller has to work double duty to run 4 sticks instead of 2. Not all memory controllers are fast enough to handle all 4 slots at the full speed. It's going to depend on your specific motherboard though, it's not a global rule that 4 sticks is always slower than 2.

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Romkslrqusz 3 points 23 days ago

I couldn’t accurately describe the complete technical reason why, but if you have a look at the specs for an AMD CPU like the 9800X3D (https://www.amd.com/...):

Max Memory Speed

2x1R DDR5-5600

2x2R DDR5-5600

4x1R DDR5-3600

4x2R DDR5-3600

Most samples will actually support frequencies in excess of that, what is published is what is guaranteed to work among non-defective chips.

It has to do with the overall bandwidth of the CPU’s Integrated Memory Controller.

Back before AMD published this info, I had diagnosed a few cases where support for a given frequency changed based on what I thought was capacity (e.g 24GB vs 32GB) but may have actually been related to module count.

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halcyoncmdr 3 points 23 days ago

Also a reminder that frequency is not everything, timings are nearly as important. A lower frequency with tighter timings can achieve better performance.

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slazer2au 5 points 23 days ago

Carefully looks at my server with 8 16GB sticks.

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Wolf314159 1 point 23 days ago path: 0 26019396, hotness: undefined, score: 1, children: 0
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