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[OFFICIAL] FX-8320/FX-8350 Vishera Owners Club - Page 1287

post #12861 of 67223
Thread Starter 
Quote:
Originally Posted by dsmwookie View Post

I thought max voltage was 1.55v?

That is the "official" max voltage, yes.

We however are insane, and run our CPUs at almost 1.7v for benching.
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post #12862 of 67223
Quote:
Originally Posted by MrLinky View Post

Hello all. I built my first real AMD setup not too long ago, and while I'm waiting for my H220 to arrive, I've been doing a little overclocking on my 8350 with an inadequate Hyper 212 redface.gif.

I have two questions that Google doesn't seem to have the answer to:

1) What is the maximum safe voltage for the CPU/NB?
2) Does anybody run their Vishera's CPU/NB at or above 2800MHz?
welcome !~
1.45v and yes some people do run them that high but is not needed. you can just do ~1.2-1.3v for most overclocks.
Quote:
Originally Posted by IOSEFINI View Post

I read somewhere that is around 1.45V. I needed like 1.375V for 2600
No need to run it @ that speed. CPU/NB clock = or > than RAM speed. Stock is 2200MHz. Its not like Phenoms, where high CPU/NB clocks increased performance
+1
Quote:
Originally Posted by dsmwookie View Post

I thought max voltage was 1.55v?
you are thinking about cpu core

here is the source if you were wondering also have max volts for everything
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post #12863 of 67223
Thanks for the responses IOSEFINI, KyadCK and Mega Man. I am currently running 2600MHz with 1.262v stable (memtest and Prime95 Blend). It takes 1.425v to boot 2800MHz (I didn't stress it) and I was wondering if 1.45v+ would be realistic for a 24/7 overclock.

Interestingly enough, the AMD FX tuning guide that Mega Man linked said:
Quote:
"In the case of the AMD FX-8150BE CPU the default CPU NB VID is usually 1.100V. The Maximum CPU NB VID value is 1.550V."

and...
Quote:
"The CPU NorthBridge (CPU NB) clock speed determines the efficiency and bandwidth capacity of the Memory controller. L3 cache runs at this frequency as well."

Is this true or is it probably a copy/paste job from a Phenom II guide?
 
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post #12864 of 67223
I run my cpu/nb and HT @ 2571

3dmark vantage cpu score :
@ 2200/2200 4.6 = 24950
@ 2600/2200 4.6 = 25175
@2517/2517 4.6 = 25405

@2200/220 4.7 = 25000

Running crossfire @ 16x2 seem to need at least 2400HT
Ram @ 1866mhz 8-9-9-24-7-5-7-7-14-300-33-2T

While i understand the logical difference between this chip and my 1055t, Cpu/Nb has shown a increase on my 8350's..

Note that I am specifically talking about the cpu score not the overall P score.
Edited by Vencenzo - 4/28/13 at 8:16pm
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post #12865 of 67223
Quote:
Originally Posted by Vencenzo View Post

I run my cpu/nb and HT @ 2571

3dmark vantage cpu score :
@ 2200/2200 4.6 = 24950
@ 2600/2200 4.6 = 25175
@2517/2517 4.6 = 25405

@2200/220 4.7 = 25000

Running crossfire @ 16x2 seem to need at least 2400HT
Ram @ 1866mhz 8-9-9-24-7-5-7-7-14-300-33-2T

While i understand the logical different between this chip and my 1055t, Cpu/Nb has shown a increase on my 8350's..

Are those scores from an 8350?
 
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post #12866 of 67223
Quote:
Originally Posted by MrLinky View Post

Are those scores from an 8350?

Aye

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post #12867 of 67223
Thread Starter 
Quote:
Originally Posted by MrLinky View Post

Thanks for the responses IOSEFINI, KyadCK and Mega Man. I am currently running 2600MHz with 1.262v stable (memtest and Prime95 Blend). It takes 1.425v to boot 2800MHz (I didn't stress it) and I was wondering if 1.45v+ would be realistic for a 24/7 overclock.

Interestingly enough, the AMD FX tuning guide that Mega Man linked said:
Quote:
"In the case of the AMD FX-8150BE CPU the default CPU NB VID is usually 1.100V. The Maximum CPU NB VID value is 1.550V."

and...
Quote:
"The CPU NorthBridge (CPU NB) clock speed determines the efficiency and bandwidth capacity of the Memory controller. L3 cache runs at this frequency as well."

Is this true or is it probably a copy/paste job from a Phenom II guide?

It may be the case with 8150s, but not 8350s. Probably a Ph II guide.
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post #12868 of 67223
Unless I'm missing something obvious, I think the L3 cache is still affected by the CPU/NB speed.

The Tom's Hardware Vishera review states that "The same Sandra 2013 module also reflects very little change in L3 latency, and Vishera’s architects confirm that no changes were made to the L3 cache shared by all modules on an FX package." (In reference to Bulldozer).
http://www.tomshardware.com/reviews/fx-8350-vishera-review,3328-3.html

I also did some quick cache benchmarks:




Each Northbridge frequency increase shows improvements in speed and latency for the L3 cache. Now whether that translates to anything worthwhile outside of benchmarks is a different story tongue.gif.
Am I on to something here or is this worthy of a face-palm?
 
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post #12869 of 67223
Naw that's easy.
Test FPS in Unreal3 engine games with different NB speeds. Tera is a prime example because of constantly loading/unloading textures.
It's also poorly optimized and only utilizes 2 cores/1 gpu by default. It's a good game for benching applicable ram/individual core speed and it's free.
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FX-8350 ASUS Crosshair V Formula Z R9 280x XFX Black edition G.Skill Trident 
Hard DriveHard DriveOptical DriveCooling
Seagate barracuda Samsung 840 evo Random LG dvd writer/reader NZXT Kraken x60 
CoolingOSMonitorMonitor
3x 120mm, 4x 140mm, 1x 80mm Windows 7 Ultimate Hanns G 32" Dell 24" sharp 
KeyboardPowerCaseMouse
Saitek Cyborg Evga supernova 1300 gs Ikonik mid tower Mx518 
Audio
Wow headset 
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post #12870 of 67223
Post Deleted by Paladine
Edited by Paladine - 7/1/13 at 3:52am
    
CPUMotherboardGraphicsRAM
AMD FX-8320 990FXA-UD3 AMD Radeon HD 7850 G.Skill RipjawsX 1866MHz CL9 
RAMHard DriveHard DriveOptical Drive
G.Skill RipjawsX 1866MHz CL9 OCZ Vertex 3 MAX SSD 240GB RAID Array Lite-ON Super AllWrite DVD+/- RW Black 
CoolingOSMonitorKeyboard
Corsair H100i Windows 7 Home Premium 64bit LG Flatron E2770 Microsoft Sidewinder X6 
PowerCaseMouse
Thermaltake Smart SE Modular 80+ Bronze 730W CoolerMaster CM 690 II Advanced USB 3.0 Microsoft Sidewinder X8 
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CPUMotherboardGraphicsRAM
AMD FX-8320 990FXA-UD3 AMD Radeon HD 7850 G.Skill RipjawsX 1866MHz CL9 
RAMHard DriveHard DriveOptical Drive
G.Skill RipjawsX 1866MHz CL9 OCZ Vertex 3 MAX SSD 240GB RAID Array Lite-ON Super AllWrite DVD+/- RW Black 
CoolingOSMonitorKeyboard
Corsair H100i Windows 7 Home Premium 64bit LG Flatron E2770 Microsoft Sidewinder X6 
PowerCaseMouse
Thermaltake Smart SE Modular 80+ Bronze 730W CoolerMaster CM 690 II Advanced USB 3.0 Microsoft Sidewinder X8 
  hide details  
Reply
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