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AMD GPU Drivers: The Real Truth. - Page 10

post #91 of 454
Corsair didn't test sandy-e, but ivy-e, however the main differences are either the memory channel number, or memory class - not the processor series, afaik.
2133 MHz 2R memory next to 2400 MHz makes for very wild differences.
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post #92 of 454
I suppose it is fair to say - let alone sandy-e controller - even the ivy-e IMC unit cannot handle 2400MHz frequencies. So, my guess to your performance deficit is because of;
  1. the terrible write speeds at 2400MHz due to the incapability of the controller in handling this setting,
  2. 1R totally missing out on the benefits of 2R as a clear "straight bar" from 1600 MHz to 2400 MHz,
  3. 2400 MHz 1R actually comparing "worse" than 1866 MHz '2R'.
I think you are quite lucky with the cpu you have got, yet the title needs a change, imo. Also, I'd urge you to check out some nice 2133 MHz dimms. Nothing like a good memory, I'm thinking of making the jump to 2R memory myself.smile.gif
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post #93 of 454
Quote:
Originally Posted by BradleyW View Post

My RAM only has chips on one side of the PCB. So this could be slowing my CPU down?

No, not to any significant degree.

All other things being equal, more ranks per channel will result in more performance (due to greater interleaving), but the difference is usually very small in practice.
Quote:
Originally Posted by BradleyW View Post

If so, can I go with 4GB sticks which have IC's on both sides? (Sorry, I'm by no means a RAM expert). Feel free to PM me to continue the discussion.

Older ICs mainly, and if you had to sacrifice clock speed for them, you'd lose more performance than you'd gain. Also, two single rank DIMMs in the same channel is usually functionally identical to one dual-rank DIMM.

Regardless, I don't think your memory is holding you back at all.
Edited by Blameless - 9/20/15 at 12:50am
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post #94 of 454
Quote:
Originally Posted by PontiacGTX View Post

you know that auto sport is nvidia biased so the comparison is meaningless..

try something different and more cpu bound because it doesnt have a big difference between 720 and 1080 just 1%

It is an Intel sponsored game but shows the GPU usage as low as 55% for the FX in places. That to me shows what the API is doing on the AMD side (or that AMD just haven't optimised) but if the usage was as high as the TX, it would be a lot closer.

I felt it showed what Bradley was talking about in the OP but happy to be proven wrong.
    
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post #95 of 454
Thread Starter 
Quote:
Originally Posted by Blameless View Post

No, not to any significant degree.

All other things being equal, more ranks per channel will result in more performance (due to greater interleaving), but the difference is usually very small in practice.
Older ICs mainly, and if you had to sacrifice clock speed for them, you'd lose more performance than you'd gain. Also, two single rank DIMMs in the same channel is usually functionally identical to one dual-rank DIMM.

Regardless, I don't think your memory is holding you back at all.

Thank you for the input.
I was looking at all the Fire Strike Physics results for the 3930K at 4.5GHz. Many have the same score as mine. Some however, had +500 to 800 points more. Those with the higher score have 8GB DIMMS at very high speed (2400MHz), which are usually dual-ranked, so I think there is some degree of evidence that dual rank helps on enthusiast platforms. In light of this, do you still believe in your original point or is it worth looking into in depth? I'm in the middle on this one. smile.gif
Edited by BradleyW - 9/21/15 at 6:58am
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post #96 of 454
I've found out dual rank memory won't be an option for my case according to this news - *should have gone Kaveri* mad.gif
Else, 2133 MHz version of the same ram you have in your signature is "single rank", but this bears little problem with ddr3 if you would just stick another set in.
Quote:
8GB GeIL EVO Potenza Onyx Black DDR3-2133 DIMM CL10 Dual Kit
However the actual sensible advice I got is why don't you try the XMP profile at 2133 MHz? Write speeds could improve as per stated in the above charts which are looking phenomenal on paper to say the least.biggrin.gif
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post #97 of 454
Thread Starter 
[edit.
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post #98 of 454
Quote:
Originally Posted by BradleyW View Post

Thank you for the input.
I was looking at all the Fire Strike Physics results for the 3930K at 4.5GHz. Many have the same score as mine. Some however, had +500 to 800 points more. Those with the higher score have 8GB DIMMS at very high speed (2400MHz), which are usually dual-ranked, so I think there is some degree of evidence that dual rank helps on enthusiast platforms. In light of this, do you still believe in your original point or is it worth looking into in depth? I'm in the middle on this one. smile.gif

All other things being equal, you will get optimal memory performance with two (or more) ranks of memory per channel. Optimal memory performance is not necessary for a driver overhead comparison, and probably won't even reveal itself in any real world task outside archival or certain database applications.

FireStrike's physics test may or may not be memory dependent enough to reveal a significant differences between single and dual-rank DIMMs. The difference in score could be explained by many things, and even if pinned down to memory, secondary and tertiary timings will usually make more of a difference than extra memory ranks.

I generally think Fire Strike on-line comparisons are of very limited utility. The scores are subject to bugs, manipulation, and the benchmarks will often pass on extremely flaky systems.
Quote:
Originally Posted by mtcn77 View Post

I've found out dual rank memory won't be an option for my case according to this

More ranks, more stress on the IMC, and most CPUs will support faster memory speeds with fewer ranks.

It's guidelines though, not hard limits, and unless you have very restrictive firmware you can almost always exceed these limits.
Quote:
Originally Posted by mtcn77 View Post

However the actual sensible advice I got is why don't you try the XMP profile at 2133 MHz? Write speeds could improve as per stated in the above charts which are looking phenomenal on paper to say the least.

XMP tends to feature extremely loose secondary and tertiary timings, and even modest tweaking will usually result in significantly better performing settings.

Memory speeds in the above chart aren't particularly exceptional either. Ivy-E is where I would expect it, other than the anomaly at DDR-2400, while the Haswell and Haswell-E part looks like it's being held back by a stock or near stock uncore clock.
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post #99 of 454
Thread Starter 
Got a bit of a strange one here. I will try and explain as best I can.
When I enter a CPU dominant location on a game whilst Crossfire is enabled, my fps goes down.
When I go to the location again, but with Crossfire disabled, my fps is a fair bit higher.
I've noticed this in Mad Max and MGSV TPP.
Check this. The fps is always 71-72 in any game I play when testing in a CPU dependant location.

I hope you all got that. Here is an example with MAD MAX.
Warning: Spoiler! (Click to show)
CFX ON

CFX OFF

Settings (1080p used to keep frames generally higher during testing)


Here are the questions. Why 71fps every time? Is this how fast my CPU can work, or is it the draw call limit on the AMD driver? And why do I get negative CFX scaling "only in CPU dominant locations"?

FYI in get perfect scaling in GPU bound locations.

Thank you.
Edited by BradleyW - 9/23/15 at 7:56am
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X79-GCN
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Intel 3930K 4.5GHz HT GIGABYTE GA-X79-UP4 AMD R9-290X GEil Evo Potenza DDR3 2400MHz CL10 (4x4GB) 
Hard DriveCoolingCoolingCooling
Samsung 840 Pro 120GB EK Supremacy (CPU) NF F12's P/P (360 Rad)  NF A14's (420 Rad)  
CoolingCoolingCoolingCooling
XSPC Chrome Compression Fittings EK RES X3 150 Primochill PremoFlex Advanced LRT Clear 1/2 ID EK-FC (R9 290X) 
CoolingCoolingCoolingOS
EK D5 Vario Top-X  Phobya G-Changer V2 360mm Phobya G-Changer V2 420mm Win 10 x64 Pro 
MonitorKeyboardPowerCase
BenQ XR3501 35" Curved Corsair Vengeance K90 Seasonic X-1250 Gold (v2) Corsair 900D 
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Logitech G400s Senn HD 598 
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post #100 of 454
Quote:
Originally Posted by BradleyW View Post

Got a bit of a strange one here. I will try and explain as best I can.
When I enter a CPU dominant location on a game whilst Crossfire is enabled, my fps goes down.
I've noticed this in Mad Max and MGSV TPP.
Warning: Spoiler! (Click to show)
CFX ON

CFX OFF

Settings (1080p used to keep frames generally higher during testing)

Here are the questions. Why 71fps every time? Is this how fast my CPU can work, or is it the draw call limit on the AMD driver? And why do I get negative CFX scaling "only in CPU dominant locations"?
not an AMD problem

https://steamcommunity.com/app/234140/discussions/0/527274088407416296/

try using AFR from another avalanche engine game.
reduce the FoVand CPU related settings
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