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AMD 760K Richland 3.8GHz PAIRED with an XFX Radeon 7850 question??? - Page 3

post #21 of 22
suga,

The Richland 760K has a dual channel memory controller. If you install only a single DIMM, it will be forced to run in single channel mode, which will reduce the maximum available system memory bandwidth.

If you were running an APU and intending to use the iGPU, then you would want dual channel RAM running as fast as possible since the iGPU would be leveraging system RAM as VRAM and every last drop of VRAM bandwidth up to ~2400MT/s speeds counts towards some performance gain.

As a discrete CPU (like the 760K), the difference in performance between single and dual channel RAM varies by workload but is often nill as most compute workloads found on the desktop (gaming, browsing, productivity apps etc) won't bottleneck on memory bandwidth anyway.

Interestingly enough, in dual channel mode, the memory controller and/or limited CPU performance is the bottleneck, as it can not saturate the available bandwidth of the dual channel configuration regardless. From what I have been able to gather, the difference in available bandwidth going from single to dual channel on the FM2 platform may have less effect on bandwidth than one might anticipate, as in single channel mode, the memory controller seems to be able to saturate more of the available cycles (makes better use of what is available). Dual channel will always have more available bandwidth at a given speed, but not "double."

If you want to get a single 1x8GB stick, you should buy this instead: http://pcpartpicker.com/part/crucial-memory-blt8g3d1608et3lx0
You can easily overclock that to 2133-2400MT/s with tight timings. At that speed, single channel won't be a problem for the 760K.

Otherwise, if you want to rest easy knowing you haven't introduced any unnecessary sources of performance losses, get a 2x4GB kit instead.

If a dual channel kit@1600MT/s isn't bottle-necking an i7-4770K, then a single channel kit isn't going to be a problem for the lowly 760K.

YMMV.
     
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CPUMotherboardGraphicsRAM
FX-8350 990X EVO R2.0 Sparkle GTX460 768MB ballistix tactical 2 x 8GB 
Hard DriveHard DriveOptical DriveCooling
Toshiiba THNSNH 256GB Enterprise RE3 1TB Asus BD combo drive Artic A30 
OSMonitorMonitorMonitor
Manjaro Linux Samsung 21.5" LCD E2009WFP E2009WFP 
PowerCase
Seasonic G 550W Modular Fractal Design Core 3500 
CPUMotherboardGraphicsRAM
FX-6300, 4.7 GHZ@1.43V GA-970A-UD3P GTX 460 768MB Mixed DIMMs. 2x4GB + 2x8GB @ 1600-8-8-8 
Hard DriveHard DriveHard DriveHard Drive
Toshiba THNSNH 19nm 256GB 1TB Spinpoint F3 WD RE3 1TB WD RE3 1TB 
Optical DriveCoolingOSOS
yes CM Seidon 120V SolydK OpenSuse 13.1 
OSOSMonitorMonitor
Linux Mint 9-32 bit // Linux Mint 17-64 bit  Manjaro Xfce Samsung 21.5" HannsG 21.5" sideways! 
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Sticky ATNG Rosewill Green 630W NZXT Gamma Basic Microsoft corded 
CPUMotherboardGraphicsRAM
A10-6800k 4.8GHZ @ 1.375V, 1.2GHZ iGPU Gigabyte GA-F2A85XN-WIFI HD8670D Ripjaws 
Hard DriveOptical DriveCoolingOS
Seagate ST1000DM003 Asus BC-12B1ST/BLK/B/AS Zalman CNPS5X Linux Mint 15 
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post #22 of 22
To be honest, BF4 is a harder game than BF3 on system resources, and my Athlon 750K and HD 7850 get a consistent 80-102FPS on medium settings. I also have the A85XA-G65 MSI board, and OC'd to Trinity's max of 4.5 GHz. You will see solid results, as medium on BF4 is still better than a PS4... It runs high settings, 2x AA, and SSAO, between 40-50FPS, but it is a limitation of the card, not CPU as CPU is at 75-80% usage, while GPU is at 100%. But I also have a golden Powercolor PCS+ that OC's to 1290 GPU core and 5400 Memory..

Also run dual channel. They put it on there for a reason, as you may not see a difference, but when the CPU requests memory, even if a request doesn't take up a full memory chip on the stick, another task has to be on a different chip. Also each module then has it's own stick of ram to work with. You may not saturate it, but many hands make lighter work.
Edited by agrims - 4/1/14 at 10:22am
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Overclock.net › Forums › AMD › AMD CPUs › AMD 760K Richland 3.8GHz PAIRED with an XFX Radeon 7850 question???