Over clocking help, please

[rkshelton21]

I want some over clocking help... pretend anything you say, you might be saying to someone who is computer literate, but an overclocking moron.

I am running:

Mobo: ASUS P5N-E SLI LGA 775 NVIDIA nForce 650i SLI ATX Intel

Proc: Intel Core 2 Duo E6600 Conroe 2.4GHz LGA 775

Vid: EVGA GeForce 8800GTS 640MB

RAM: 2x Kingston 1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)

I have the current setting then available settings in []

So....

Here are my BIOS options

--Jumper Free Config

------System Clock

---------NB PCIE Frequency (MHz) 100 [100 to 131]

---------no Idea what this is, figured I would leave it alone

------Voltage Control

---------VCore Voltage Auto [~.831 to ~1.6]

---------I was thinking about 1.47 or 1.5 area it is about 1.31 right now I think

---------Memory Voltage Auto [~1.92 to ~2.51]

---------I was going to try 2.4, not sure about that though

---------NBCore Voltage Auto [~1.2 to ~1.7]

---------No idea what it is, just like the NB PCIE

---------VCore offset Voltage Auto [Auto or +100mv]

---------Planned on leaving this the same

------FSB and Memory Configuration

---------Linked or unlinked ratios of 1:1 5:3 or 3:2 I think, those are by memory, I forgot to write that one down.

---------FSB (QDR), MHz 1066 [533 to 3000]

---------I was gonna try 2000

---------MEM (DDR), MHz 800 [400-2600]

---------and here 1500

--Memory Timing Setup

-----these were all on auto

-----CL (CAS) 4

-----RCD 4

-----RP 4

-----RAS12

-----Command Per Clock (1 or 2) no idea

OK, so, what looks like a terrible idea. What makes you think OMG you noob, don't touch that! And what looks good? Any feedback at all is good feedback. I think. Anyway, help me out if you can. I would rather not ruin this board

 

[PV5150]

Here are my BIOS options

--Jumper Free Config

------System Clock

---------NB PCIE Frequency (MHz) 100 [100 to 131]

---------no Idea what this is, figured I would leave it alone (a)

------Voltage Control

---------VCore Voltage Auto [~.831 to ~1.6]

---------I was thinking about 1.47 or 1.5 area it is about 1.31 right now I think (b)

---------Memory Voltage Auto [~1.92 to ~2.51]

---------I was going to try 2.4, not sure about that though (c)

---------NBCore Voltage Auto [~1.2 to ~1.7]

---------No idea what it is, just like the NB PCIE (d)

---------VCore offset Voltage Auto [Auto or +100mv]

---------Planned on leaving this the same (e)

------FSB and Memory Configuration

---------Linked or unlinked ratios of 1:1 5:3 or 3:2 I think, those are by memory, I forgot to write that one down. (f)

---------FSB (QDR), MHz 1066 [533 to 3000]

---------I was gonna try 2000 (g)

---------MEM (DDR), MHz 800 [400-2600]

---------and here 1500 (h)

--Memory Timing Setup

-----these were all on auto

-----CL (CAS) 4

-----RCD 4

-----RP 4

-----RAS12

-----Command Per Clock (1 or 2) no idea (i)

(a) NB PCIE Frequency is the frequency setting for your PCIE bus...Set it to 100. If you leave it at 'auto' you may experience corruption of your Windows install once you start overclocking.

(b)vcore is the voltage that your CPU needs in order to function. Default for C2D's is usually around 1.325 volts. You should be able to get to 3.0Ghz or possibly a little higher on stock volts - no higher than 1.5v on air, 1.6 for water. Adding the extra voltage to your cpu for stability is done here.

(c)Your memory should have a default voltage on the side of the module (probably 1.8 - 2.1 volts). If your memory is warranted to go above that then by all means do when overclocking (tight timings or high frequency).

(d)NB Core voltage - you shouldn't need more than 1.5v unless your going beyond a 500FSB.

(e)Vcore offset Voltage option allows you to increase the CPU voltage by smaller voltage increments.

(f)unlinked ratios are good if you have lower quality or flakey ram. Linked means your RAM speed (the frequency it operates at) uses the SAME FSB as your CPU. Hence the term "linked".

With unlinked you can set a different fsb for the RAM as well as the CPU. to a certain extent. You may get higher CPU clocks with unlinked, but your RAM may be slower.

Memory ratio: this is the ratio of CPU MHz to RAM MHz. (i.e. 1:1, 5:4, 3:2)

Memory clock mode: This is usually either auto, linked, or unlinked. If it is linked, you can set your memory ratio. If it is unlinked, you may set the memory clock to whatever you feel like.

Link here explains it better.

(g) 1066 is the bus speed of your processor, leave it at that.

(h) PC2-6400 RAM = 800Mhz.

(i)Your motherboard detects your RAM timings via the SPD (Serial Presence Detect) or via the EPP (Enhanced Performance Profiles) bios codes on your RAM when set to 'Auto'. EPP basically allows for automatic forced timings on Nvidia based boards, or essentially an overclock out of the box. EPP was developed by Nvidia and Corsair.

Command clock is the ability to run RAM at 1T or 2T. Typically you can expect additional performance by running your RAM @ 1T to be in the vicinity of 3 -5%.

I hope this makes sense as I have to hurry off to take a lecture and only had 5 mins. I'll discuss more if need be when I get home.

 

[da2ca]

Thanks PV5150 I’m sure this will help quite a few people out (me being one). A very good explanation that. It definitely explained a few things to me, as when I get my water cooling rig done as over clocking will be the next thing I do after the initial run in. :worship::

 

[PV5150]

no problems mate, my pleasure. I'm @ home now so I can explain things further if you need me to

 

[koganinja]

hi i got it wrot down but can you post on your expalntion what settings to turn off

 

[rkshelton21]

(g) 1066 is the bus speed of your processor, leave it at that.

So, if I am leaving the bus speed the same, then how am I over clocking anything? I thought the point was to raise the FSB? If I'm not changing that, the only thing I'm really changing is the voltage.

Also I left off 1 more thing, the CPU multiplier which is set at 9 but goes from like 5 to 30 or something like that. I was under the impression that it was

(CPU multiplier) x (FSB MHz) = (Clock Speed GHz) but, some how doing the math seems off.

Anyway, should I mess with the CPU multiplier?

Also, your answers rocked and were very helpful :worship:

 

[PV5150]

Yes mate but your bus is actually quad-pumped remember and your processor runs at a 1066 FSB (also known as FSB strap or FSB QDR for your motherboard). If you were running an 1333 FSB processor like the E6850 then that would default to the 1333 FSB strap instead of 1066. See below:

FSB strap/ FSB QDR = CPU frequency x 4

E6600 - 266 x 4 = 1064 (processor runs at a FSB strap of 1066)

To overclock

Using your E6600's default multiplier of 9 then up your cpu bus from 266:

9 x 266 (CPU frequency) = 2394Mhz (2.4Ghz - default clock speed of your processor)

9 x 333 = 2997Mhz (3.0Ghz)

9 x 400 = 3600Mhz (3.6Ghz)

So you need to keep the FSB QDR @ 1066 but in order to overclock you need to increase your cpu's frequency from 266 upwards. I hope that makes sense

 

[rkshelton21]

I get it, deff makes sense. Now the only problem is trying to find in the BIOS where I set the cpu frequency.

I think I know where... I will try as soon as I get home and let you know if I have problems. Thanks!

 

[rkshelton21]

*SIGH*

Overclocking Features

- AI Overclocking (intelligent CPU frequency tuner)

- ASUS CPU Lock Free

- Precision Tweaker:

- vCore: Adjustable CPU voltage at 6.25mv increment

max. 1.6V

- vChip: 4-step Chip voltage control

adjust Chip voltage max. 0.55V

- vDIMM: 8-step DRAM voltage control

adjust DRAM voltage max. 0.6V

- SFS (Stepless Frequency Selection)

- FSB tuning from 200MHz up to 750MHz at 1MHz increment

- PCI Express frequency tuning from 100MHz up to 131MHz at 1MHz increment

- CPU Multiplier

- ASUS C.P.R.(CPU Parameter Recall)

It says it, but I can't find it in the freaking BIOS, so where do I do it?

 

[nrage]

Update bios to the latest version (if you haven't already)

Make sure you have disabled all the automatic overclocking features, one of these might be hiding the FSB freq setting.

Google to see if anyone else had the same trouble and if they managed to solve it.

 

[rkshelton21]

In the subsection FSB & memory config we have access to the frequency of system bus FSB and memory system bus .

FSB can be set in the frequency limits from 133 to 750 MHz. The frequency of memory is advanced with FSB, using dividers FSB : DRAM equal 1:2, 5:8, 3:4 and 1:1. NVIDIA nForce 650i SLI does not have a completely asynchronous generator for memory system bus . After the installation of the desired value in BIOS Setup the motherboard chose the most suitable divider and will indicate the actual memory frequency . In the majority of the cases this frequency differ from the desired one by not more than 10-20 MHz in the smaller side. However, the range of memory frequencies , which is allowed by ASUS P5N- E SLI in asynchronous regime varies from 400 to 2600 MHz.

I don't understand! you can set the freq from 133-750 but it really only supports 400-2600? I obviously have no idea wth is going on here.

 

[rkshelton21]

It seems from what I have read, that the FSB(QDR) is the only thing I can change, and that it is the frequency, just multiplied by 4? It looks like everyone else is changing that to like 1960 giving ~ 3.4GHz ?

[1960/4 = 490] [490*7=3430] [where 7 is the cpu multiplier]

So, I should be changing that, right?

 

[nrage]

It seems from what I have read, that the FSB(QDR) is the only thing I can change, and that it is the frequency, just multiplied by 4? It looks like everyone else is changing that to like 1960 giving ~ 3.4GHz ?

[1960/4 = 490] [490*7=3430] [where 7 is the cpu multiplier]

So, I should be changing that, right?

Yeah, I think you've got that right. My motherboard has a similar cmos setup. If you want to figure out your maximum cpu overclock then make sure you unlink your cpu/mem.