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Best RAM Speed for Bulldozer

post #1 of 8
Thread Starter 
Hi forum,

Just got a new FX 8120, and I was wondering what sort of RAM speed bulldozer likes. I have Kingston HyperX 1800 CL9 1.7-1.9v modules. So there's that. I can also run these modules at 1600 6-8-6 @1.8v.

Higher speed, tighter timings? What does Bulldozer like?

Also, is there a RAM voltage cap like there is with some Intel chips? (i.e. is 1.7v-1.9v to high?)

Thanks!
    
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post #2 of 8
Quote:
Originally Posted by WildcatWhiz View Post

Hi forum,
Just got a new FX 8120, and I was wondering what sort of RAM speed bulldozer likes. I have Kingston HyperX 1800 CL9 1.7-1.9v modules. So there's that. I can also run these modules at 1600 6-8-6 @1.8v.
Higher speed, tighter timings? What does Bulldozer like?
Also, is there a RAM voltage cap like there is with some Intel chips? (i.e. is 1.7v-1.9v to high?)
Thanks!

Congrats on the 8120. It should OC very well. thumb.gif

If you haven't read the FX Owner's Thread, you should. There is a lot of good info. to help you in that thread.

http://www.overclock.net/t/1139726/amd-fx-bulldozer-owners-club

By default the FX CPUs use a 1866 MHz. RAM frequency. If your RAM will run at that frequency, that's probably where you should set it or as close as it will go. There is no need to over-volt most DDR3 RAM beyond 1.65v though 1.7v should be safe if needed.

You can see how tight of latencies you can run - just for fun as testing on both AMD and Intel desktop PCs has shown that with DDR3 RAM there is little to no tangible performance gains in real applications on desktop PCs with tighter latencies or higher frequencies once you get to ~1333 MHz.

http://www.overclock.net/t/1206332/help-me-through-my-bottleneck-6-7-6-24-1t-1333mhz/20#post_16432691

AMD Llano/APUs are the exception as both the CPU and GPU can access the higher frequency and that does improve real world performance. Increased frequency is best with the APUs. Latencies don't make any tangible diff.

As the frequency increases one clock cycle becomes less and less in real time. Since the DDR3 RAM isn't a bottleneck there isn't much to be gained. Some folks have OC'ed the FX CPU RAM to 2400 MHz. and seen ZIP for performance gains because the RAM is not a bottleneck.

Benches will show a small improvement but that doesn't seem to transfer to real apps. for most folks.

Intel has even announced they will stick with DDR3 until 2014 because it's not a bottleneck.

http://www.fudzilla.com/home/item/26169-intel-sticks-with-ddr3-till-2014
Edited by AMD4ME - 3/12/12 at 4:34pm
post #3 of 8
Thread Starter 
Thanks for the response...I'm digging through the owner's club right now.

My RAM is designed to run at 1.7-1.9v. I'm asking two questions:


(1) Will high voltage (1.7-1.9v) damage my CPU's IMC?

(2) Does anyone have any benches/data to support the optimal RAM frequency/timings for BD? I'm having a hard time finding anything. I basically want to know whether I should run low and tight (e.g. 1600 cl6 or cl7) or high and loose (e.g. 1800 cl9).

Thoughts?
    
CPUMotherboardGraphicsRAM
FX 8120 ASUS M4A89GTD PRO/USB3 890GX 2 x Asus 5770 CuCore 2 x 2GB Kingston HyperX 1800Mhz 
Hard DriveCoolingOSMonitor
64 GB Kingston V-Series Err, 10 Gallons of Mineral Oil and a Automotive... Windows 7 x64 SP1 24" Asus LCD 
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Razer BlackWidow Ultimate 600W Seasonic Aquarium with ~10 gallons of mineral oil Razer DeathAdder 
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Razer Kabuto 
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CPUMotherboardGraphicsRAM
FX 8120 ASUS M4A89GTD PRO/USB3 890GX 2 x Asus 5770 CuCore 2 x 2GB Kingston HyperX 1800Mhz 
Hard DriveCoolingOSMonitor
64 GB Kingston V-Series Err, 10 Gallons of Mineral Oil and a Automotive... Windows 7 x64 SP1 24" Asus LCD 
KeyboardPowerCaseMouse
Razer BlackWidow Ultimate 600W Seasonic Aquarium with ~10 gallons of mineral oil Razer DeathAdder 
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Razer Kabuto 
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post #4 of 8
Quote:
Originally Posted by WildcatWhiz View Post

Thanks for the response...I'm digging through the owner's club right now.
My RAM is designed to run at 1.7-1.9v. I'm asking two questions:
(1) Will high voltage (1.7-1.9v) damage my CPU's IMC?
(2) Does anyone have any benches/data to support the optimal RAM frequency/timings for BD? I'm having a hard time finding anything. I basically want to know whether I should run low and tight (e.g. 1600 cl6 or cl7) or high and loose (e.g. 1800 cl9).
Thoughts?

I wouldn't go past 1.75v without damn good cooling. Your DDR3 is older, back when IMC's on CPU's were on older and larger processes which were more voltage tolerant at the time. With that said, i've ran 1.8v on my Phenom 2 but don't like doing so 24/7.

So, i wouldn't go past 1.7ish on Bulldozer. That's just me.

BD likes high bandwidth. Timings arent as important, unless you cant get super high bandwidth.

I'd rather run 2200 @ 10-11-10 than 1866 9-9-9. Benchmarks don't lie. Higher bandwidth = higher scores.

Real world difference? None. rolleyes.gif
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by Dmac73 View Post

I wouldn't go past 1.75v without damn good cooling. Your DDR3 is older, back when IMC's on CPU's were on older and larger processes which were more voltage tolerant at the time. With that said, i've ran 1.8v on my Phenom 2 but don't like doing so 24/7.
So, i wouldn't go past 1.7ish on Bulldozer. That's just me.
BD likes high bandwidth. Timings arent as important, unless you cant get super high bandwidth.
I'd rather run 2200 @ 10-11-10 than 1866 9-9-9. Benchmarks don't lie. Higher bandwidth = higher scores.
Real world difference? None. rolleyes.gif

Thank you thank you. This is exactly what I was looking for.
    
CPUMotherboardGraphicsRAM
FX 8120 ASUS M4A89GTD PRO/USB3 890GX 2 x Asus 5770 CuCore 2 x 2GB Kingston HyperX 1800Mhz 
Hard DriveCoolingOSMonitor
64 GB Kingston V-Series Err, 10 Gallons of Mineral Oil and a Automotive... Windows 7 x64 SP1 24" Asus LCD 
KeyboardPowerCaseMouse
Razer BlackWidow Ultimate 600W Seasonic Aquarium with ~10 gallons of mineral oil Razer DeathAdder 
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Razer Kabuto 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
FX 8120 ASUS M4A89GTD PRO/USB3 890GX 2 x Asus 5770 CuCore 2 x 2GB Kingston HyperX 1800Mhz 
Hard DriveCoolingOSMonitor
64 GB Kingston V-Series Err, 10 Gallons of Mineral Oil and a Automotive... Windows 7 x64 SP1 24" Asus LCD 
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post #6 of 8
As I stated above 1.7v is safe and there are no system performance gains in real apps. on desktop powered PCs with RAM frequencies above ~1333 MHz. Synthetic benches show small improvements but that doesn't carry over to real world applications because the DDR3 RAM is not a system bottleneck at ~1333 MHz. as the links referenced show.
post #7 of 8
Quote:
Originally Posted by Dmac73 View Post

I wouldn't go past 1.75v without damn good cooling. Your DDR3 is older, back when IMC's on CPU's were on older and larger processes which were more voltage tolerant at the time. With that said, i've ran 1.8v on my Phenom 2 but don't like doing so 24/7.
So, i wouldn't go past 1.7ish on Bulldozer. That's just me.
BD likes high bandwidth. Timings arent as important, unless you cant get super high bandwidth.
I'd rather run 2200 @ 10-11-10 than 1866 9-9-9. Benchmarks don't lie. Higher bandwidth = higher scores.
Real world difference? None. rolleyes.gif

Remember there is a ddr2 controller on your chip aswell. And most high speed ddr2(1066Mhz for eg.) is rated at 2.1v. So 1.8v ram running 24/7 is no problem for Phenom II.
post #8 of 8
Quote:
Originally Posted by MrTOOSHORT View Post

Remember there is a ddr2 controller on your chip aswell. And most high speed ddr2(1066Mhz for eg.) is rated at 2.1v. So 1.8v ram running 24/7 is no problem for Phenom II.

My chip is AM3. It takes DDR3 only. You either have DDR2 or DDR3 Mem controller. Not either or.
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