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Trying to understand RAM O/Cing

post #1 of 5
Thread Starter 
Please help me, I need help understanding memory O/Cing.
1st. my board don't support my ram speed, board speed 1866(o/c) ram rated 2000, does this mean what ever I do the ram should take it?
2nd. if I want/need to slow the ram speed do I just decrees my memory multiplier?
3rd. when people say "tighten" your memory timing, does this decrease or increase the timing number's?
4th. is Kingston Hyper X ram any good for O/Cing an AMD chip, on a GA-870A-UD3 board?
5th. What do the numbers mean, in lay men terms, for memory timing, ie. 9-9-9-27-1T? and would I need to increase these or decrease these to run more stable?
6th and final is not memory related, well maybe, I have gotten to 4Ghz and it is booting and I can do basic things, but when I go to run Prime95 or even run a game like CNC4 the computer resets on my. Is this something I should be looking at the memory or else were for?

I will read all replies and even try any suggestion's if you give me enough time. We only have PC at home, time is limited.
post #2 of 5
No, memory will run at 1333 or 1600mhz by default, upon increasing fsb it will reach the max value of (~)1866mhz.

Yes, decreasing the fsb would have the same effect too.

decrease the timing numbers.

You said your ram is rated at 2000MHz, why are you worrying about OCing? If you are talking about decreasing latency then yes.

for detail info on memory timings, please visit this link: << http://www.techpowerup.com/articles/...AMD/memory/131 >> By default the mem timings are usually set at the rated values (ie in your case 9 9 9 27 1t). To decrease mem latency (and thus increase performance) you have to lower those values, to something like this 8 8 8 27 1t. Different mem chips have different level of tolerance for such tweaking. Too much lower and you get unstable memory, so the bottom-line here is... the closer to the rated values, the more stable memory you have.

For this part you must post the details about your OC settings. cpu speed, multi, fsb, ht, cpu-nb, voltages, ram settings etc.
Edited by leopold1985 - 6/2/11 at 3:21pm
    
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CPUMotherboardGraphicsRAM
Phenom II X4 955BE ASUS M4A88TD-V-EVO/USB3 MSI GTX 560Ti TwinFROZR II OC Corsair XMS3 2x2GB 1600MHz C9 
Hard DriveOSMonitorPower
2x500GB Seagate Windows 7 Ultimate 32bit Samsung 20" B2030 Corsair TX650 V2 
Case
CM HAF932 (painted black) 
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Reply
post #3 of 5
Thread Starter 
Sorry should of thought about posting my settings first:

Clock Ratio x14=4004
North Bridge Freq.x10=2860
Core Performance Dis.
FSB 286
HT link width Auto
HT link freq. x7=2002
Memory clock x4=1144

Dram Voltage 1.66v
NB voltage 1.14v
CPU NB VID control1.45v
CPU voltage control1.5v

this is from CPU-Z = Dram Freq762.7
timing = 8-8-8-20-27-1T
post #4 of 5
You should be able to push 2000Mhz RAM with that x6. 1866 (OC) or 2000 (OC) is by no means a memory standard on that board; you should ignore what motherboards say about RAM speed support on AMD boards, with the memory support being related more the integrated memory controller on the CPU, that info is useless.
Tips:
-2000Mhz RAM requires 250Mhz bus clock x8 or more ideally 300Mhz bus clock, if you have your 1055 at 4Ghz you'd probably be running closer to 300Mhz anyway. 300Mhz should be doable on that board.
-Use CPU-NB voltage, you will need it as the high speed will be more stressing on the IMC
-Make sure to set the RAM to whatever rated timings and voltage, manually!

Concerning the restarting computer on Prime95, you may be unstable somewhere i.e. push more voltage.
post #5 of 5
Your FSB would be 286 for the cpu to hit 4.0ghz.
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SAMSUNG EcoGreen F4 2TB Plextor Black Blu-ray Burner Phenom II X4 stock Cooler Windows 10 
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LG M2762D-PM Glossy Black 27" 5ms (1920x1080) Antec HG 900 Gerenic ATX Case 
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HTPC
(11 items)
 
  
CPUMotherboardRAMHard Drive
AMD A-3870K AsRock A75 Pro (FM1) HyperX DDR3 1866 8 GB SAMSUNG 830 256gb 
Hard DriveOptical DriveCoolingOS
SAMSUNG EcoGreen F4 2TB Plextor Black Blu-ray Burner Phenom II X4 stock Cooler Windows 10 
MonitorPowerCase
LG M2762D-PM Glossy Black 27" 5ms (1920x1080) Antec HG 900 Gerenic ATX Case 
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Reply
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