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Lower Bandwidth and Tighter timings or Higher bandwidth and Looser Timings AMD FX8350

eidairaman1

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Ok y'all here is a whopper question of mine. Is it better to have ram with less overall bandwidth frequency with tighter timings or More bandwidth with a little looser timings with higher voltage for my FX 8350 (Overclocked at 5.1Ghz)

My memory is Gskill Ripjaws X 2133 MHz part number F3-2133C9-16GXH (dual channel kit), 1.6V, Timings of 9,11,11,31,42, Command 1T or 2T.

I currently have them set to 2400 MHz with timings of 10,12,12,31,42, Command 2T (able to run 1T fine). 1.65V, Equals the [TridentX] F3-2400C10D-16GTX) Kit

I'm just looking to improve overall memory performance. I have tried a few different timings that are a little tighter at both 2133 or 2400-get BSODs at that point and I know my motherboard has way more settings for timing and drive strength than I have knowledge of what they do.
 

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Isn't 2133 C9 virtually the same in performance as 2400 C10? I'm not a mem whiz but I distinctly remember that going up a step in freq and timings simultaneously is not a huge difference. Like 1333 C9 is the same as 1600 C11, 1600 C9 ==> 1866 C10 etc.

IMO such a small step will have no tangible benefit in performance, and IIRC Vishera and Richland have a weak IMC.

I mean, 2133 C9 is already pretty good and timings pretty tight.

I found an old thread http://www.techpowerup.com/forums/threads/timing-rules.185943/page-2
 
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@cadaveca has done a lot of testing in this arena, maybe he could offer his opinion.
 
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I would assume tighter timings seeing as FX is a very high latency CPU.

Tighter timing and lower overall clock speed - my XEON's IPC goes up.
 
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I've had AMD cpu based rigs; and got to play around with Intel cpu's with limited time <8 hours, and recently assembled my very own Intel rig with first thought being this is fast, second toughts being did I missed out?, I think I missed out.
From the looks of it I don't know, I've ran a Thuban(non BE) at 3ghz clock 3ghz NB. 3ghz HT and 2ghz ram.
There is a balance that your rig can do.........
Do you not fancy those numbers or what?, keep HT link at or around about default(if you oc'ed using bckl, also), raise NB multiplier clock( sensible to NB voltage when applied NB multibler more than 1x-2x above stock)
 

cadaveca

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Ok y'all here is a whopper question of mine. Is it better to have ram with less overall bandwidth frequency with tighter timings or More bandwidth with a little looser timings with higher voltage for my FX 8350 (Overclocked at 5.1Ghz)

My memory is Gskill Ripjaws X 2133 MHz part number F3-2133C9-16GXH (dual channel kit), 1.6V, Timings of 9,11,11,31,42, Command 1T or 2T.

I currently have them set to 2400 MHz with timings of 10,12,12,31,42, Command 2T (able to run 1T fine). 1.65V, Equals the [TridentX] F3-2400C10D-16GTX) Kit

I'm just looking to improve overall memory performance. I have tried a few different timings that are a little tighter at both 2133 or 2400-get BSODs at that point and I know my motherboard has way more settings for timing and drive strength than I have knowledge of what they do.
Take the 2400.

The weakness in AMD CPU memory performance is directly related to CPU cache speeds. So do not just pay attention to memory bandwidth, also pay attention to the CPU cache bandwidth (try using AIDA64). Naturally, lower latency has its benefits, but because the CPUs cache is a bit slow, its used to compensating for additional latency. Depending on what type of workload you use the most, either will be better; there is no single "perfect" option.

That said, 2133 MHz to 2400 MHz is a very small difference, and for the sake of long-term stability, I'd just go with the 2133 MHz CL9 timings.
 
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I'm getting better folding performance with 1333 and low latency but not tight memory ganged not unganged and with ecc on, odd but true.like 250k ppd up to 300.
I have all slots loaded for some reason 32GB
 
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As a general rule:
AMD's prefer tighter timings with less RAM speed overall vs what Intels like which is more RAM speed with looser timings.

Now..... IF you can get decent timings and speeds from your setup regardless of what chip is in it I'd call that a win.
 

eidairaman1

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well trying to put tighter timings at 2400 than what is set like the triden set above (Ripjaws X is what I got) it bsods. it be nice if i could have the 2400 MHZ clock but with the 2133 or even 1866MHz timings. The ram likes 1.65Volts at 2400 and 1.6 at 2133.

by the way the board is defaulted to unganged.
 
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I had mine set that way for years and it IS quicker as you say , I just thought i'd try it though , I get similar bandwidth even with ecc on at these low speeds, what's you're northbridge and cpunb volts and nb speed atm, just interested is all, I did run 2133 cas9 8gigs at one point but the more memory you put in the lower it clocks ,mines technically at 1390 cad 8 with my Nb at 2390 and my Ht at 2700 my cores are at 4.8 24/7 for folding(for longevity) though I can boost them in software stabily for benches and gaming:).

I can't explain the ppd boost I've got bar putting it down to bad memory clocking before yet it tested fine , ah well, awwsome 5.1 thx though mate, still I need 1.6 core V for 5.1 stable so its not for folding or summer for that matter.

Should have said cpuNB volts can stabilize high clocks and tight timings on memory a bit but costs heat obv.
 
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eidairaman1

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mrk i will have to check my mobo settings when im home. im at work
 

eidairaman1

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@cadaveca @theoneandonlymrk @dont whant to set it"' @tabascosauz @Recon-UK @Bones @AthlonX2 @fullinfusion @Johan45 @JrRacinFan @manofthem @ThE_MaD_ShOt @Norton @cdawall @GhostRyder @stinger608 @rtwjunkie

Sorry for the Late Reply Y'all- Its busy work to fix Laundry Equipment.
Here are my bios screens

http://img.techpowerup.org/160703/capture001-20160703.jpg


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you said in 1st post : (able to run 1T fine) - so i would run 1T.
and i think 1,70 or 1,75volt on ram should be no prob-you are not afraid to push cpu-so dont be on the ram.
should be samsung based memory-can you read seriel number on sticker of ram?
they like odd numbers like 9-11-9 or 9-12-10
 

eidairaman1

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id have to open the case and look at them. the timings screen shows what xmp/dcop runs. ill get more pics when available
 
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capture008-20160703.jpg
Have to ask - I noted you have several settings in this screen thats really too high.
CPU current capability for example doesn't need to be at it's max (140%), leaving it at 100% will work in most any case short of extreme cooling scenarios - I've ran mine with no more than 110% even doing that and I've had no problem getting to the speeds I want. This will also make it run a little hotter too.
Load line calibration settings are also the same, you don't have to have those set so high either and doing so will make it run hotter as well right along with your RAM settings and all else these affect.

Like it's saying to the right of the BIOS shot you took, it can and will make things get hotter and there is simply no need to have everything jacked up like this unless you're running it with extreme cooling. I have one of these boards and it's pushed a FX 8 core quite well without having all these settings maxed out, here's one run I've done as described. http://hwbot.org/submission/2521522_bones_wprime___32m_fx_8320_5sec_906ms

Now..... It's your stuff and do with it as you please, I'm just saying this can and probrably will cause problems down the road if it isn't already doing so, unless there is a problem with the machine being stable with lower settings or something I'd reset these to 100% and gradually tune from that point as needed.
 

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As a general rule:
AMD's prefer tighter timings with less RAM speed overall vs what Intels like which is more RAM speed with looser timings.

Now..... IF you can get decent timings and speeds from your setup regardless of what chip is in it I'd call that a win.


Totally agree and thats why I have memory that is 6-8-6-24 1600MHz, lowest ive ever seen for 1600MHz RAM.
 

eidairaman1

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I'll try to lower the llc settings etc.
View attachment 76299
Have to ask - I noted you have several settings in this screen thats really too high.
CPU current capability for example doesn't need to be at it's max (140%), leaving it at 100% will work in most any case short of extreme cooling scenarios - I've ran mine with no more than 110% even doing that and I've had no problem getting to the speeds I want. This will also make it run a little hotter too.
Load line calibration settings are also the same, you don't have to have those set so high either and doing so will make it run hotter as well right along with your RAM settings and all else these affect.

Like it's saying to the right of the BIOS shot you took, it can and will make things get hotter and there is simply no need to have everything jacked up like this unless you're running it with extreme cooling. I have one of these boards and it's pushed a FX 8 core quite well without having all these settings maxed out, here's one run I've done as described. http://hwbot.org/submission/2521522_bones_wprime___32m_fx_8320_5sec_906ms

Now..... It's your stuff and do with it as you please, I'm just saying this can and probrably will cause problems down the road if it isn't already doing so, unless there is a problem with the machine being stable with lower settings or something I'd reset these to 100% and gradually tune from that point as needed.

@theoneandonlymrk your board is good- just i think its just the chip lotto.
 

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Run some benchmarks and see? My guess is nothing will change more than a fraction of a FPS
 
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I'll try to lower the llc settings etc.

@theoneandonlymrk your board is good- just i think its just the chip lotto.
well your bating has got me biting lol I have sold this 8350 ,and for a bit more a 9370 will be mine instead , see how that goes ;)
 

eidairaman1

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well your bating has got me biting lol I have sold this 8350 ,and for a bit more a 9370 will be mine instead , see how that goes ;)

those are ultra leaky chips.
 

cdawall

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well your bating has got me biting lol I have sold this 8350 ,and for a bit more a 9370 will be mine instead , see how that goes ;)

Don't. The 9370's are only good on cold.
 

eidairaman1

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Don't. The 9370's are only good on cold.

custom loop probably.

Zen arrives might move and give my wife the upgrade she needs, probably have Zen and my gpu under water.
 

cdawall

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custom loop probably.

Zen arrives might move and give my wife the upgrade she needs, probably have Zen and my gpu under water.

Unless the loop is cold a low leak chip will beat a high leak chip
 

eidairaman1

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Memory 16 GB Gskill Ripjaws X 2133 (2400 OC, 10-10-12-20-20, 1T, 1.65V)
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well who knows i might custom loop the 8350 and the gpu, nb, sb, vrm, ram and see if i can get further than 5.1GHz, 5.2 is harsh on it. I might drop the ram speed and see how tight the kit can get at 1600 and 1866.


When I built this rig I was going to go with a 8300 then, however I got the 8350 due to priceing and availability. Runs Zippity at 4.2-5.1GHz anyway lol
 
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