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Memory overclocking?

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a b } Memory
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March 22, 2011 5:16:28 PM

I know I hvae posted on this before, but now I have read things that makes me not sure I understood right. When taking my 1333Mhz RAM to 1600Mhz I don't overclock the CPU and the RAM, I just set the RAM ratio to whatever it needs to be, right? If I had a AMD Phenom II X4 955 BE which has a 200Mhz FSB I would put that RAM/FSB ratio 8 eight, not OC to the CPU, and it would be fine, right? I wanna make sure I know what I am doing. So, the real question is, do I need to OC the CPU to achieve 1600Mhz?

More about : memory overclocking

March 22, 2011 6:52:21 PM

It should be, but I'm no expert. Try it and see what happens
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March 22, 2011 6:55:19 PM

Okay, well you see, I don't have the parts yet, and I don't want to order parts that won't run right.
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March 22, 2011 6:56:22 PM

What parts are you ordering?
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March 22, 2011 6:58:42 PM

I was looking at an ASRock 870 Extreme3 motherboard, AMD Phenom II X4 955 BE, and 4gb Corsair 1600Mhz RAM. I know I will need to overclock the RAM, I just want to make sure I know how.
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March 22, 2011 8:24:24 PM

If you're only doing it to do it, you probably don't even need to OC your RAM
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March 22, 2011 9:38:55 PM

kilo_17 said:
If you're only doing it to do it, you probably don't even need to OC your RAM

I want my RAM to run @ 1600Mhz, not 1333Mhz. I am not just doing it to do it, that would be silly! :lol: 
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March 22, 2011 10:00:49 PM

If the RAM is rated at 1600 MHz then you're not OC the RAM. To OC RAM you adjust the Frequency {higher} than Spec and/or the CAS {lower} than Spec and DRAM Voltage to achieve stable {rated DRAM Voltage +0.0~+0.3v max}.

Example OC RAM:
Rated = 1333 MHz CAS 9-9-9-1N @ 1.5v
OC RAM = 1600 MHz CAS 8-8-8-2N @ 1.50~1.55~1.60v
Run Memtest86+ 4 passes.

Example Underclocked RAM:
Rated = 1600 MHz CAS 9-9-9-1N @ 1.5v
Running = 1333 MHz CAS 9-9-9-1N @ 1.5v

If your MOBO says 1600 (OC), 1333, etc... then if your RAM is 1600 then you might need to increase the FSB to keep the RAM stable {disparity -> IMC to RAM Frequency}. Some MOBOs do this for you, use the DRAM Frequency -> DDR3-1600 MHz, and set the CAS Timings, and DRAM Voltage per spec.
//
Biostar Mcp6p m2+ Support Dual Channel DDR2 533/667/800 MHz

ASRock 870 Extreme3 Supports DDR3 1800(OC)/1600(OC)/1333/1066/800 non-ECC, un-buffered memory

Example:
1600 9-9-9-24-2N @ 1.65v
Looked at the manual, it seems to do it for you:
Memory Clock -> [800MHz DDR3_1600].
DRAM Voltage -> Set to closest 1.65v
OC Tweaker:
CAS Latency (CL) -> 9
TRCD -> 9
TRP -> 9
TRAS -> 24
---
MA Timing -> 2T

Save & Exit
Done!

FYI officially the X4 955 BE supports 1333 MHz, but there are plenty of folks running it at 1600 MHz.
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March 22, 2011 10:48:40 PM

jaquith said:
If the RAM is rated at 1600 MHz then you're not OC the RAM. To OC RAM you adjust the Frequency {higher} than Spec and/or the CAS {lower} than Spec and DRAM Voltage to achieve stable {rated DRAM Voltage +0.0~+0.3v max}.

Example OC RAM:
Rated = 1333 MHz CAS 9-9-9-1N @ 1.5v
OC RAM = 1600 MHz CAS 8-8-8-2N @ 1.50~1.55~1.60v
Run Memtest86+ 4 passes.

Example Underclocked RAM:
Rated = 1600 MHz CAS 9-9-9-1N @ 1.5v
Running = 1333 MHz CAS 9-9-9-1N @ 1.5v

If your MOBO says 1600 (OC), 1333, etc... then if your RAM is 1600 then you might need to increase the FSB to keep the RAM stable {disparity -> IMC to RAM Frequency}. Some MOBOs do this for you, use the DRAM Frequency -> DDR3-1600 MHz, and set the CAS Timings, and DRAM Voltage per spec.
//
Biostar Mcp6p m2+ Support Dual Channel DDR2 533/667/800 MHz

ASRock 870 Extreme3 Supports DDR3 1800(OC)/1600(OC)/1333/1066/800 non-ECC, un-buffered memory

Example:
1600 9-9-9-24-2N @ 1.65v
Looked at the manual, it seems to do it for you:
Memory Clock -> [800MHz DDR3_1600].
DRAM Voltage -> Set to closest 1.65v
OC Tweaker:
CAS Latency (CL) -> 9
TRCD -> 9
TRP -> 9
TRAS -> 24
---
MA Timing -> 2T

Save & Exit
Done!

FYI officially the X4 955 BE supports 1333 MHz, but there are plenty of folks running it at 1600 MHz.

Gee, thanks. So basically leave it how it was when I got it and change the ratio to 8 because 8 x 200Mhz = 1600Mhz for my RAM? If it isn't stable, then increase the FSB a little to OC my CPU and keep the RAM stable?
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a c 347 } Memory
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March 22, 2011 11:19:56 PM

Some MOBO's use a Memory Multiplier e.g. Gigabyte and others do the math for you and you simply set the DRAM Frequency {Memory Clock} to the desired/rated Frequency. Some MOBO + CPU require the FSB to be increased {normally 1800+MHz} RAM and then only 6-core AMD's will support the ultra-high frequency RAM.

If it isn't stable the first thing I go for is the DRAM Voltage; {rated DRAM Voltage +0.1~+0.3v max}. Next, increase the NB Voltage {+0.1~+0.3v max}.

Failure then the typical 'stable' increase for FSB {210~225}.

Typically, this is a RAM or NB Voltage issue.

--
The static FSB increase:
1333/200 = 1600/FSBx ; FSBx = 240
The CPU ratio decrease:
3200/200 = 16 ; 3200/240 = 13.3 {so 13 or 14}
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March 23, 2011 12:10:36 AM

jaquith said:
Some MOBO's use a Memory Multiplier e.g. Gigabyte and others do the math for you and you simply set the DRAM Frequency {Memory Clock} to the desired/rated Frequency. Some MOBO + CPU require the FSB to be increased {normally 1800+MHz} RAM and then only 6-core AMD's will support the ultra-high frequency RAM.

If it isn't stable the first thing I go for is the DRAM Voltage; {rated DRAM Voltage +0.1~+0.3v max}. Next, increase the NB Voltage {+0.1~+0.3v max}.

Failure then the typical 'stable' increase for FSB {210~225}.

Typically, this is a RAM or NB Voltage issue.

--
The static FSB increase:
1333/200 = 1600/FSBx ; FSBx = 240
The CPU ratio decrease:
3200/200 = 16 ; 3200/240 = 13.3 {so 13 or 14}

So what if I wanted 4Ghz from an AMD Phenom II X4 955 I could set my multiplier to 20 and FSB to 200, ram ratio to 8, and then I would be running 4GHz RAM and 1600Mhz RAM, right? If it is still not stable turn up the voltage, then if it is still not stable, turn up the NB, and if it STILL not stable, I would turn my FSB to 210Mhz and multiplier to 19 and still get 4Ghz etc. Tell me if I am wrong.
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March 23, 2011 12:30:30 AM

Yeah, 4GHz CPU, as long as you have a GOOD CPU FAN! Use Prime95 and a Temp App. It's all about find the correct Voltage + Temps assuming compatible components e.g. RAM.

If you OC the CPU to 4GHz you're going to need to increase the CPU Voltage {1.40~1.45v} otherwise 9.99/10 it won't post. There's no exact Voltage - it varies on each 'particular' CPU/MOBO. I always look for the LOWEST + STABLE Voltages, and get use to Post Failures... ;) 

The math is the Math. Even on my unlocked 980X I use both BCLK + CPU Multiplier + Voltages. Also, I assume your MOBO has 'BIOS Profiles' ; make one Stock and add others: Stock, 3.6GHz, OMG 4.0GHz, etc.

Apps:
1. Prime 95 as a "Stress Test" {overnight once stable}
link - http://www.mersenne.org/freesoft/

2. CPU-Z for Settings Summary
link - http://www.cpuid.com/softwares/cpu-z.html

3. CoreTemp 0.99.x
link - http://www.alcpu.com/CoreTemp/

4. Memtest86+ to check memory corruption
link - http://www.memtest.org/
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March 23, 2011 1:07:53 AM

Gee, thanks for all the help, man. I use OCCT instead of Prime95, and OCCT tells you the temp of each core and gives graphs afterwards. I could only get my CPU to 3.3Ghz stable, but I think that is due to my piece of garbage motherboard. Yeah, the ASRock has OC DNA so I should be able to save my OC. I will be running the stock fan, so I doubt I can hit 4Ghz, but I have read some reviews of people doing it. I don't care if it is loud, just fast! :lol:  I think I will get like 3.7/8Ghz. I won't get all of this unless I can sell my current machine and put some of my own money towards it though. Anyways. have a good one! :) 
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March 23, 2011 1:09:54 AM

Btw, just wanted to make sure you didn't think I was only talking about OCing my CPU to 4Ghz when I set up the example, I meant getting my RAM to 1600Mhz too. It would work how I explained it, right?
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March 23, 2011 1:47:02 PM

Most folks seem to settle with 3.8 GHz 19 X 200 with 1.375~1.4v.

It all depends upon your components. I still am unclear what MOBO you have, but I did see ASRock 870 Extreme3 listed which supports DDR3 1600MHz; you mention multipliers which is more like a Gigabyte MOBO.

If you have a low phase MOBO, poor CPU Fan, and inadequate and/or old {dirty power} PSU then it will be difficult if not impossible to OC as discussed.

Note: if you disable all of the Power savings -- it a really bad idea in the long run. The power consumption is stuck 7/24 in high gear -- if this is your MO then use BIOS Profiles and use the 'Crazy 4GHz' only when needed.
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March 23, 2011 5:25:33 PM

jaquith said:
Most folks seem to settle with 3.8 GHz 19 X 200 with 1.375~1.4v.

It all depends upon your components. I still am unclear what MOBO you have, but I did see ASRock 870 Extreme3 listed which supports DDR3 1600MHz; you mention multipliers which is more like a Gigabyte MOBO.

If you have a low phase MOBO, poor CPU Fan, and inadequate and/or old {dirty power} PSU then it will be difficult if not impossible to OC as discussed.

Note: if you disable all of the Power savings -- it a really bad idea in the long run. The power consumption is stuck 7/24 in high gear -- if this is your MO then use BIOS Profiles and use the 'Crazy 4GHz' only when needed.

http://www.newegg.com/Product/Product.aspx?Item=N82E168... I am now thinking of that board, it has 8+2 power Phases. It will also let me put the voltage up in very low increments to insure a non-overvolted system! :D  I will be using a high-quality XFX 650w PSU, an ASRock or ASUS motherboard, high-quality RAM, and the stock heatsink. I know the stock heatsink is loud, but it is supposed to be pretty good. I'll see what I can do. Do you know how to find out how many power phases the ASRock motherboard has? I think it has 5, but I am not sure.
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March 23, 2011 5:27:21 PM

Yup! It has a 4+1 power phases design.
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March 23, 2011 5:31:26 PM

I don't know if you'll get really far on the stock heatsink. My X4 640 shoots up to like 65C running Prime95 at stock, if I remember right. Of course, results will vary, so you might be able to get a decent OC with the stock cooler.
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March 23, 2011 5:59:34 PM

kilo_17 said:
I don't know if you'll get really far on the stock heatsink. My X4 640 shoots up to like 65C running Prime95 at stock, if I remember right. Of course, results will vary, so you might be able to get a decent OC with the stock cooler.

If I can't get past 3.5GHz on the stock heatsink, I don't really care. It's a FREE upgrade, I can't complain. :lol: 
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March 23, 2011 6:33:09 PM


I don't get it. What are you telling me? I see he got 4.2Ghz @ 40C idle, but it can hit 62C max temp. I think I can get 3.7/8Ghz. If not, I can just wait till I have money to buy a nice CM CPU cooler. Like the Hyper N 520.
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March 23, 2011 9:23:28 PM

Running Idle means zip. Running hot means zip. Running Prime95 or whatever equal App overnight means Stable.

My point was your MOBO with its phases can reach 4GHz+. Seemed to be confirmed. Every MOBO + CPU is it's own thing, and the best anyone can do is ball park OC settings and look for common successes and problems with a MOBO.

HSF - Thermaltake Frio will cut 10C +$10 {CM 212+ $38w/shipping | TF $48 w/shipping}. Just rechecked the $ {CM 212+ $42 w/shipping | TF $58 w/shipping} so the difference 'today' is $16.
^ I left both old and new pricing for FYI.
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March 23, 2011 9:27:07 PM

Yeah, I know everything does very. My chip can only reach 3.3Ghz. :( 
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