Solved New to OC, Difference between multiplier steps?

December 23, 2013 at 16:55:06
Specs: Wind 7 home premium 64-bit, q8400 c2q@2.66
overclock multiplier by 7.5 or 7? thats the gist of it, anyways...
i recently got a better Fan/HS for my Core 2 Quad Q8400 [1333mhz@2.67g stock] so i could get "that last little bit" out of this gaming system before i need to upgrade, and now i just need a bit of feedback please:

does it make much difference, in wear&tear -or- any other sense, if i set my multiplier to 7.5[x400=3ghz] as opposed to 7[x400=~2.8ghz]???
my temps are =/<65 under 100% load @ x7.5; standard prime95 test [20min] no errorz, etc.
and of course, since ive already bought my upgraded GPU [msi PE gtx660ti SC], every little bit helps quite a bit!
...but i also dont want to unnecessarily endanger my hardware...
if u need additional info, please reply as such.
any help appreciated!


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✔ Best Answer
December 24, 2013 at 09:05:27
"ratio is @1:1 w/DDR2-800 @ 800"

The ratio IS 1:1 but DDR2-800 runs at 400MHz, not 800MHz.

"MSI P43 neo3-f"

I just had a look at the specs & downloaded the manual. The P43/ICH10 is a great chipset combo. There are different PCB versions, here's a link to PCB 1.1:

http://us.msi.com/product/mb/P43-Ne...

Multi-step OC Booster - disabled
D.O.T. Control - disabled
Intel EIST - disabled
Adjust CPU FSB Frequency (MHz) - 400
Adjust CPU Ratio - default or 8.0
FSB/DRAM Ratio - 1:1 or 1:2
Adjust PCI Frequency (MHz) - default or 33
Auto Disable DRAM/PCI Frequency - enabled
Voltages - CPU voltage is the only adjustment needed & only if necessary
Spread Spectrum - disabled

message edited by riider



#1
December 23, 2013 at 18:12:48
You didn't tell us anything about your RAM or motherboard?

For best performance, you should be maintaining a CPU:DRAM frequency ratio of either 1:1 or 1:2. Which ratio you use depends on the RAM. If you're running the CPU frequency at 400MHz, you should either be running the RAM frequency at 400Mhz (DDR800) or 800MHz (DDR1600), whichever your RAM is capable of handling. That means you may have to underclock the RAM.

With the right board, RAM, & CPU cooling, you should have no problem running the Q8400 at 3.2GHz (8 x 400MHz). Just make sure to lock the PCIe at 100MHz, disable all Spread Spectrum settings, disable SpeedStep (at least temporarily), manually configure the memory settings to maintain the optimal ratio, & adjust voltages as necessary to keep everything stable.

"...but i also dont want to unnecessarily endanger my hardware..."

Overclocking will NOT damage hardware unless you increase the voltages beyond reasonable levels. Intel specs the Q8400 voltage range as 0.8500V-1.3625V.

http://ark.intel.com/products/38512...


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#2
December 23, 2013 at 18:38:45
well -thats because im new and didnt know what to post!
MSI P43 neo3-f
ratio is @1:1 w/DDR2-800 @ 800 [mushkin enhanced silverline ddr2-800 [1.8v]]
maximum voltage, via CPU-Z = 1.360
maximum temperature is 65[c] under Stress Test full loads[prime95], 20 minutes
- "idles" in the high 30s/low 40s

BIOS[or CPU] doesnt let me change any OC settings w/speed step enabled

im not sure if/where to find lock for PCIe freq... i will check it out presently...

i have a MSI gtx 660ti SuperClocked Power Edition [for my next upgrade] and am trying to SQUEEZE!


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#3
December 23, 2013 at 20:48:20
You are fine, just get the PCIe locked at 100MHz to be sure you do not endanger your video card or at least run into stability issues related to it. As riider says, you should be able to also run 8x400 for 3.2GHz. Your idle temp is fine and your Prime95 temps you will never reach in real world use so even if it climbs a bit more, it still should be fine and your gaming temps should be somewhere in between.

You have to be a little bit crazy to keep you from going insane.


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Related Solutions

#4
December 24, 2013 at 06:48:47
thanks for the feedback...
now about that PCI-e setting... i couldnt find any option to set @100mhz pertaining to my PCIe slot, the only thing i found in the BIOS [American Megatrends, up to date{1.10?}] dealing with the PCI was "Adjust PCI Frequency" which i assume to be my standard PCI slots, and not my "-e". the options for it are "Default"[current setting], 37.3, 42...

and
"Auto Disable DRAM/PCI Frequency" - Enabled [current setting], Disabled

interrogative: i manually set my CPU core voltage to 1.280, which CPU-Z reads as steady when 'idle', but under load it drops a bit [1.280>1.248]... is this anything i need to worry about? should i bump up the voltage a step or two to try and get 1.280 while geeking, or just leave it be..?

thanks again!


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#5
December 24, 2013 at 09:05:27
✔ Best Answer
"ratio is @1:1 w/DDR2-800 @ 800"

The ratio IS 1:1 but DDR2-800 runs at 400MHz, not 800MHz.

"MSI P43 neo3-f"

I just had a look at the specs & downloaded the manual. The P43/ICH10 is a great chipset combo. There are different PCB versions, here's a link to PCB 1.1:

http://us.msi.com/product/mb/P43-Ne...

Multi-step OC Booster - disabled
D.O.T. Control - disabled
Intel EIST - disabled
Adjust CPU FSB Frequency (MHz) - 400
Adjust CPU Ratio - default or 8.0
FSB/DRAM Ratio - 1:1 or 1:2
Adjust PCI Frequency (MHz) - default or 33
Auto Disable DRAM/PCI Frequency - enabled
Voltages - CPU voltage is the only adjustment needed & only if necessary
Spread Spectrum - disabled

message edited by riider


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#6
December 24, 2013 at 09:47:46
thank you very much...
all of those settings are matched in my BIOS, or what i ended up with, but i manually set my DRAM to 1.8 and my CPU voltage core to 1.280. the former because my RAM [MUSHKIN ENHANCED SILVERLINE DDR2-800{2x1gb match set; 2x2gb match set}]
is specific about that voltage, as is the board; the latter because the CPU voltage was fluctuating between 1.352 - 1.360, which was... not ideal.
now @400x8 for ~3.2ghz | vcore@<1.280 | ratio 1:1 l DRAM voltage @1.8
its running much better, using 15% more of my GPU, and running cooler than with the multiplier @ 7 or 7.5!

would i be better off setting my vcore up a tick or two, or does that matter?

thanks again for all of the help "everyone"!!!


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#7
December 24, 2013 at 10:58:01
"would i be better off setting my vcore up a tick or two, or does that matter?"

If the system is stable, there's no reason to increase the CPU voltage. In fact, you might wanna try lowering it until the system becomes unstable, then increase it a "tick or two" from there.


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