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

post #1 of 277
Thread Starter 
I've often wondered if faster RAM helps when you are playing a game that's clearly facing optimization issues on the CPU side of things. We've all been here. From the grass land of Crysis 3 to the Shanty Town in Tomb Raider, our fps has fallen, CPU levels raised and GPU's sit dormant. Time to see if the RAM contributes.

Test System:
CPU : 3930K 4.5GHz HT
GPU: AMD 290X CFX (2)
MB: Gigabyte X79-UP4 Rev 1.1
OS: Win 10 64 bit.

RAM speeds and timing information:

GEil Evo Potenza 2666MHz DDR3 (4x4GB):
1333MHz @ CL 8
1600MHz @ CL 8
1866MHz @ CL 9
2133MHz @ CL 10
2400MHz @ CL 11

All the results you are about to see are the minimum recorded fps.

Test One - RAM Speed:

Tomb Raider ; Ultimate Preset, 1080p, FXAA.
Location: Helicopter Pad overlooking Shanty Town during sunrise.

1333MHz = 62 FPS
1600MHz = 67 FPS
1866MHz = 69 FPS
2133MHz = 72 FPS
2400MHz = 74 FPS

Crysis 3 ; Very High, FXAA, 1080p
Location: Welcome To The Jungle, overlooking mine field within the park.

1333MHz = 78 FPS
1600MHz = 82 FPS
1866MHz = 83 FPS
2133MHz = 84 FPS
2400MHz = 86 FPS

Hitman Absolution ; Ultra Preset, FXAA, 1080p
Benchmark Min fps.

1333MHz = 66 FPS
1600MHz = 69 FPS
1866MHz = 72 FPS
2133MHz = 74 FPS
2400MHz = 76 FPS

Fallout 4 ; Ultra, Light Rays Low, 2560 x 1080
Location: Outside "Diamond City", overlooking the streets during daytime.

1333MHz = 27.3 FPS
1600MHz = 28.8 FPS
1866MHz = 29.1 FPS
2133MHz = 29.3 FPS
2400MHz = 29.9 FPS

Assassin's Creed Unity ; Ultra, HBAO+, PCSS, 2MSAA, 2560 x 1080
Location: Random location overlooking large group of people.

1333MHz = 54 FPS
1600MHz = 56 FPS
1866MHz = 58 FPS
2133MHz = 60 FPS
2400MHz = 62 FPS

Mad Max ; All Settings Max, 1080p
Location ; Rot N Rusties - Enemy Camp (South).

1333MHz = 70 FPS
1600MHz = 74 FPS
1866MHz = 74 FPS
2133MHz = 74 FPS
2400MHz = 74 FPS

Rise of the Tomb Raider, Very High, 1080p
Location ; Soviet Installation (Small house after the second zip line).

1333MHz = 45FPS
1600MHz = 47FPS
1866MHz = 48FPS
2133MHz = 49FPS
2400MHz = 50FPS

Well, the results are interesting and I'm pleased to be using 2400MHz.

_____________________________________________________________________



Test TWO - Memory Single Rank vs Dual Rank:

This next test will determine the difference between single rank and dual rank memory in synthetic tests and CPU bound locations within 3D applications:

Memory Information and timings:

GEIL Evo Potenza 2666MHz DDR3 (4x4GB) SINGLE RANK
2400MHz CL11
2133MHz CL10
1866MHz CL9

Hyper-X Beast 2400MHz DDR3 (4x8GB) DUAL RANK
2133MHz CL10
1866MHz CL9


AIDA64


1866MHz

GEIL Single Rank
Copy = 43536MB/s
Latency = 60.3ns
Read = 47247MB/s
Write = 49435MB/s

Beast Dual Rank
Copy = 48364MB/s
Latency = 64.3ns
Read = 51126MB/s
Write = 52219MB/s

2133MHz

GEIL Single Rank
Copy = 48243MB/s
Latency = 56.5ns
Read = 51999MB/s
Write = 54927MB/s

Beast Dual Rank
Copy = 53510MB/s
Latency = 61.5ns
Read = 55223MB/s
Write = 58.98MB/s

2400MHz

GEIL Single Rank
Copy = 52364MB/s
Latency = 55.6ns
Read = 55777MB/s
Write = 59966MB/s



3DMark API Feature Test


1866MHz

GEIL Single Rank
DX11 S = 1 405 276
DX11 M = 1 307 128
Mantle = 21 334 564
DX12 = 17 240 632

Beast Dual Rank
DX11 S = 1 437 121
DX11 M = 1 335 030
Mantle = 23 785 750
DX12 = 17 950 241

2133MHz

GEIL Single Rank
DX11 S = 1 484 028
DX11 M = 1 366 885
Mantle = 22 814 225
DX12 = 17 453 983

Beast Dual Rank
DX11 S = 1 497 144
DX11 M = 1 355 706
Mantle = 24 153 724
DX12 = 18 065 698

2400MHz

GEIL Single Rank
DX11 S = 1 479 394
DX11 M = 1 391 146
Mantle = 23 081 269
DX12 = 17 657 303



3DMark Fire Strike


1866MHz

GIEL Single Rank
Physics = 15 915
Combined = 6 537

Beast Dual Rank
Physics = 15 981
Combined = 6 506

2133MHz

GIEL Single Rank
Physics = 16 038
Combined = 6 506

Beast Dual Rank
Physics = 15 983
Combined = 6 546

2400MHz

GIEL Single Rank
Physics = 16 046
Combined = 6 446



Cinebench CPU Test


1866MHz

GIEL Single Rank = 1151 cb
Beast Dual Rank = 1138 cb

2133MHz

GIEL Single Rank = 1148 cb
Beast Dual Rank = 1150 cb

2400MHz

GIEL Single Rank = 1155 cb


Crysis 3

Settings ; 1440p - Very High - FXAA.
Location ; Welcome To The Jungle - Play Yard Minefield.

1866MHz

GIEL Single Rank = 83 FPS
Beast Dual Rank = 84 FPS

2133MHz

GIEL Single Rank = 84 FPS
Beast Dual Rank = 84 FPS

2400MHz

GIEL Single Rank = 86 FPS



Hitman Absolution


Settings ; 1440p - Ultra - FXAA
Location ; Benchmark

1866MHz

GIEL Single Rank = 66 FPS
Beast Dual Rank = 66 FPS

2133MHz

GIEL Single Rank = 68 FPS
Beast Dual Rank = 68 FPS

2400MHz

GIEL Single Rank = 70 FPS



Mad Max


Settings ; 1440p - Highest Settings.
Location ; Rot N Rusties - Enemy Camp (South).

1866MHz

GIEL Single Rank = 74 AND 72
Beast Dual Rank = 74 AND 72

2133MHz

GIEL Single Rank = 74 AND 72
Beast Dual Rank = 74 AND 72

2400MHz

GIEL Single Rank = 74 AND 72



Tomb Raider


Settings ; 1440p - Ultimate - FXAA - All Settings ON - NO SMAA.
Location ; Shanty Town Overlooking From Heli Pad.

1866MHz

GIEL Single Rank = 69 FPS
Beast Dual Rank = 71 FPS

2133MHz

GIEL Single Rank = 73 FPS
Beast Dual Rank = 73 FPS

2400MHz

GIEL Single Rank = 75 FPS


To conclude, the IMC was not strong enough to run the memory at 2400MHz on the dual rank DIMM's due to the increased density. Dual rank is quicker in synthetic memory benchmarls. As for gaming, the single rank DIMMs pretty much match the speed of the dual rank DIMMs. In my case, the single rank 2400MHz kit is the obvious choice as it brings the highest minimum fps in games whilst remaining stable. I'm sure if my IMC could have handled the dual rank DIMM's, we would have seen them match or slightly surpass the single rank DIMM's in games at 2400MHz. However, the dual rank DIMM's are at least 1.5x the price of the single rank DIMM's. The Kingston Hyper-X kit was £189.99. The price does not justify the results when compared to the very quick and solid GEIL kit.


Evidence Content (Screenshot Form)

GIEL EVO POTENZA MEMORY
Warning: Spoiler! (Click to show)
SPEED - 1866MHz














SPEED = 2133MHz














SPEED = 2400MHz













KINGSTON HYPER-X BEAST MEMORY
Warning: Spoiler! (Click to show)
SPEED = 1866MHz














SPEED = 2133MHz













GAME SETTINGS:
Warning: Spoiler! (Click to show)









TEST EVIDENCE IN DOCUMENTATION FORM - DOWNLOAD LINK BELOW:

https://mega.nz/#!MZkHURKY!rPuHceOHp3rfCNxrJQN7HvkkJ7JawG6QnyHKq2skJdE
Edited by BradleyW - 2/7/16 at 5:21am
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post #2 of 277
Pretty consistent with the results I obtained. More interesting is the minimum framerate variations.
   
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post #3 of 277
Thread Starter 
Quote:
Originally Posted by nleksan View Post

Pretty consistent with the results I obtained. More interesting is the minimum framerate variations.

I also tested using HT and found that HT increased the fps more, when the RAM was slower. But HT did not increase fps when the RAM was running at the higher speeds such as 2133 and 2400MHz.
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post #4 of 277
Thread Starter 
OP updated.
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post #5 of 277
Interesting. And good to know. +Rep and thank you. thumb.gif
 
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post #6 of 277
Sweet to know!
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post #7 of 277
Very good!
post #8 of 277
Thread Starter 
Thanks. smile.gif
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post #9 of 277
That's actually a far bigger difference then I would have expected coming in at as much as 10FPS between 1333 and 2400 which considering we are talking 60-70 is pretty substantial. From an bang for buck stand point it looks like it makes sense to try and go for 1600MHz as the 1333 to 1600 is the biggest jump.

You should do additional tests about latency vs MHz. Like is it better to run 1333Mhz CL8 or 1600Mhz CL10 or going really loos like1866MHz CL12. It would probably interest thous who are running less then awesome ram.
Edited by Bit_reaper - 5/3/14 at 3:15pm
    
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i7 920 OC 4.0 GHz 1.35v HT on Asus P6T 1366 SLI Gigabyte GTX 970 OCZ 12GB DDR3 GOLD/Platinum mix 
Hard DriveHard DriveHard DriveHard Drive
Samsung Spinpoint F1 1TB Western digital 300GB Western digital Caviar Blue 1TB Samsung 840 EVO 250Gb 
Optical DriveCoolingOSMonitor
generic LG DVD WC'd , Supreme LT, NexXxoS Xtreme III 360, Phob... Windows 7 x64 Samsung 27" LED S27A550B 
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ACER 23" x233H Dell U3415W Logitech G11 Chieftec 850W 
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Phanteks enthoo luxe Razer deathAdder respawn steelseries Qck Yamaha HTR-6130 AV Receiver 
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Yamaha NS-50B floor tower speakers miditech Audiolink II stereo sound card 
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post #10 of 277
Awesome job, Brad. +rep. thumb.gif
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  • An Independent Study: Does The Speed Of RAM Directly Affect FPS During High CPU Overhead Scenarios?
Overclock.net › Forums › Components › Memory › An Independent Study: Does The Speed Of RAM Directly Affect FPS During High CPU Overhead Scenarios?