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An Independent Study: Does The Speed Of RAM Directly Affect FPS During High CPU Overhead Scenarios? - Page 21

post #201 of 277
Quote:
Originally Posted by PowerK View Post

Can you guys please advise which memory I should choose for my Broadwell-E system between the two below ?

DDR4-2400 CL10-12-12-28
http://www.corsair.com/en/dominator-platinum-series-32gb-4-x-8gb-ddr4-dram-2400mhz-c10-memory-kit-cmd32gx4m4b2400c10

DDR4-3200 CL16-18-18-36
http://www.corsair.com/en/dominator-platinum-series-32gb-4-x-8gb-ddr4-dram-3200mhz-c16-memory-kit-cmd32gx4m4b3200c16

Prices are about the same.

If your board will take it go with the 3200s. thumb.gif

~Ceadder smil3dbd4e4c2e742.gif
 
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post #202 of 277
Quote:
Originally Posted by PowerK View Post

Can you guys please advise which memory I should choose for my Broadwell-E system between the two below ?

DDR4-2400 CL10-12-12-28
http://www.corsair.com/en/dominator-platinum-series-32gb-4-x-8gb-ddr4-dram-2400mhz-c10-memory-kit-cmd32gx4m4b2400c10

DDR4-3200 CL16-18-18-36
http://www.corsair.com/en/dominator-platinum-series-32gb-4-x-8gb-ddr4-dram-3200mhz-c16-memory-kit-cmd32gx4m4b3200c16

Prices are about the same.

Ok. I've done some digging around and found an informative article here.
http://www.crucial.com/usa/en/memory-performance-speed-latency

True latency (ns) = clock cycle time (ns) x number of clock cycles (CL)

So, for DDR4-2400 CL10-12-12-28
1,200 MHz = 1,200,000,000 Hz
Clock cycle time (ns) = 1 / 1,200,000,000 * 10^9 = 0.83 ns
True latency (ns) = 0.833 (ns) * 10 (CL) = 8.33 ns

For DDR4-3200 CL16-18-18-36
1,600 MHz = 1,600,000,000 Hz
Clock cycle time (ns) = 1 / 1,600,000,000 * 10^9 = 0.625 ns
True latency (ns) = 0.625 (ns) * 16 (CL) = 10 ns

So... I think I'll opt for DDR4-2400 CL10-12-12-28 because I think it can clock to 3200 MHz with 16-18-18-36 with ease while DDR4-3200 CL16-18-18-36 may not clock at 2400 MHz with CL10-12-12-28 timing. Besides, CPU + motherboard may not reach DDR4-3200 MHz.
CPU and motherboard I'll be using are 6950X and ASUS Rampage V Edition 10.

DDR4-2400 CL10 = 8.333 ns
DDR4-3600 CL16 = 10 ns
DDR4-3600 CL15 = 9.375 ns
DDR4-3200 CL14 = 8.75 ns
To have a better latency than DDR4-2400 CL10, DDR4-3200 needs to be CL13 (8.125 ns)
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post #203 of 277
3200CL16

16x2 + 0 / 3.2ghz = 10.0000 ns
16x2 + 3 / 3.2ghz = 10.9375 ns
16x2 + 7 / 3.2ghz = 12.1875 ns


2400CL10

10x2 + 0 / 2.4ghz = 8.3333 ns
10x2 + 3 / 2.4ghz = 9.5833 ns
10x2 + 7 / 2.4ghz = 11.2500 ns

You'd probably be better off with the 2400CL10 as it has better latency across the board, but some specific applications might still favor the 3200CL16. You may want to test that too.

If you could run the 3200CL16 as 3120CL13, it'd match the 2400CL10 on the 1st word while having better latency on the 4th and 8th word.
Edited by Kana Chan - 6/27/16 at 4:34am
post #204 of 277
Quote:
Originally Posted by Kana Chan View Post

3200CL16

16x2 + 0 / 3.2ghz = 10.0000 ns
16x2 + 3 / 3.2ghz = 10.9375 ns
16x2 + 7 / 3.2ghz = 12.1875 ns


2400CL10

10x2 + 0 / 2.4ghz = 8.3333 ns
10x2 + 3 / 2.4ghz = 9.5833 ns
10x2 + 7 / 2.4ghz = 11.2500 ns

You'd probably be better off with the 2400CL10 as it has better latency across the board, but some specific applications might still favor the 3200CL16. You may want to test that too.

If you could run the 3200CL16 as 3120CL13, it'd match the 2400CL10 on the 1st word while having better latency on the 4th and 8th word.
Hi Kana.
Cheers for the informative post.
Main usage of my rig is gaming. biggrin.gif
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post #205 of 277
Quote:
Originally Posted by PowerK View Post

[...]

In those calculations you made, you looked at how fast the CPU starts receiving data out of RAM after it asked to read something from a certain spot. Can you now add to your work and also look at how fast the reading will complete? The 2400 and the 3200 memory kits have very different transfer rates. How fast will the CPU be able to get 4 bytes and 8 bytes etc.? When reading a large enough block of data, the 3200 kit should be able to beat the 2400 one, and maybe that happens already pretty early and the 3200 is still the better choice.

I don't understand how the transfer works exactly. I think it sends 64-bit at a time, and the advertised 2400MHz is the rate at which it sends those 64-bit blocks. This means it'll be 128-bit of data for one 1200MHz clock cycle? I don't know how things are supposed to add to the latency you already calculated when trying to find out how fast the CPU will finish receiving 8 bytes, 16 bytes, etc.
post #206 of 277
ddr4 3600 c15 worth getting ? smile.gif
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post #207 of 277
Over what?

3600 vs 3000 at 1440p / 2x980ti
arma3 ~4.1%
cod black ops 3 ~4.1%
civ 5 ~2.8%
fallout4 ~15%
division ~1.4%
witcher3 ~4.2%
witcher3 ~1.4% ( single gpu )
post #208 of 277
So am I right that it is still better to go for high frequency ram over low latency one for highest min fps?
post #209 of 277
Quote:
Originally Posted by sebna View Post

So am I right that it is still better to go for high frequency ram over low latency one for highest min fps?
its all about balance

http://www.hardware.fr/articles/940-5/cpu-ddr4-vs-ddr3-pratique.html
post #210 of 277
Thanks for the screenshots. Such a shame it looks like they went for avg. fps in oppose to minimal? Am I right it is avg . fps?
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