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QX6700 FSB help

post #1 of 5
Thread Starter 
I've assembled my own computers many times before, but I've always been a good boy and stuck to factory settings. So I find myself in need of some help.

I've just bought a new system to assemble. I was trying to decide between a Core 2 6800 and the QX6700 - I eventually decided on the QX intending to O/C it to 3GHz to run it like a quad core 6800. I know it's not much of an overclock, but it's enough for me for now.

So, I was just going to up the FSB to 300MHz and keep the factory multiplier setting of 10x. However, beeing a real noob, I wasn't sure how this would effect my RAM speed (DDR2 800MHz) and if I would need to adjust voltage settings for such a small O/C.

How will my RAM go if it's running at 400MHz and my FSB is running at 300MHz? What should I do?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
QX6700 ASUS P5W64 PowerColor X1950XTX 512Mb DDR4 Corsair XMS 6400C4Pro (2 x 1Gb) 4-4-4-12 
Hard DriveOptical DriveOSMonitor
WD Caviar 500Gb + Maxtor 300Gb Sony DRU-830A Windows XP Pro SP2 Samsung 215tw 21" Widescreen 
KeyboardPowerCaseMouse
Logitech G15 ThermalTake Toughpower 750W Antec Nine Hundred Logitech MX Revolution 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
QX6700 ASUS P5W64 PowerColor X1950XTX 512Mb DDR4 Corsair XMS 6400C4Pro (2 x 1Gb) 4-4-4-12 
Hard DriveOptical DriveOSMonitor
WD Caviar 500Gb + Maxtor 300Gb Sony DRU-830A Windows XP Pro SP2 Samsung 215tw 21" Widescreen 
KeyboardPowerCaseMouse
Logitech G15 ThermalTake Toughpower 750W Antec Nine Hundred Logitech MX Revolution 
  hide details  
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post #2 of 5
drop your ram to 533 then bump up the fsb that way it will run in 1:1 as for the voltage i dont think you should have to up it at all
post #3 of 5
Firstly congratulations on the purchase of your Core 2 Quadro 6700

You wish to simply increase the Bus Speed of your system from 266.6MHz to 300MHz correct?

You are able to simply increase the bus speed if you so wish.

However, you must be aware of this fact. When increasing the Bus Speed of your processor the CPU Voltage (if Defined as AUTO) will increase in conjunction to maintain stability of the system. This value most likely will not need to be increased, therefore to prevent the moderate increase in temperature I suggest you set the CPU Voltage (Vcore) to a manual value, within reason.

When increasing the CPU Bus speed the Memory speed will also increase by a factor. This factor is determined by the FSB : DRAM ratio set within your system BIOS. By default this value is usually 1:1 (Direct Conjunction).

Your QX6700 bus speed is 266MHz, therefore the Quad Pumped FSB value is 1066MHz.
If your CPU was in a 1:1 ratio your memory would operate at 533MHz at default settings. At 300MHz Bus speed (1200MHz QDR) your memory will operate at 600MHz.

To determine Memory Speed within a Direct Conjunction Ratio.
Bus Speed x 2 = DRAM Speed
300MHz Bus = 600MHz DDR/DDR2

However, you specified that your Memory is Operating at 400MHz with a Bus Speed of 266MHz, therefore your system is not running a 1:1 ratio.

Your ratio will be:

266 x 3 = 798 / 2 = 399MHz
Ratio 3:2.

Therefore your Memory will operate at approximately 450MHz in this ratio, at 300MHz Bus Speed (1.2GHz QDR).
post #4 of 5
Thread Starter 
Just out of curiosity, if I used the BIOS's AI Overclocking feature with a setting of "FSB1200/DDR2-800" that would give me the same result and apply the correct ratio automatically? Are there any drawbacks to using this method? It feels a little like cheating...

But if it gets me my 300MHz bus and the most out of my 800MHz RAM, then why not?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
QX6700 ASUS P5W64 PowerColor X1950XTX 512Mb DDR4 Corsair XMS 6400C4Pro (2 x 1Gb) 4-4-4-12 
Hard DriveOptical DriveOSMonitor
WD Caviar 500Gb + Maxtor 300Gb Sony DRU-830A Windows XP Pro SP2 Samsung 215tw 21" Widescreen 
KeyboardPowerCaseMouse
Logitech G15 ThermalTake Toughpower 750W Antec Nine Hundred Logitech MX Revolution 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
QX6700 ASUS P5W64 PowerColor X1950XTX 512Mb DDR4 Corsair XMS 6400C4Pro (2 x 1Gb) 4-4-4-12 
Hard DriveOptical DriveOSMonitor
WD Caviar 500Gb + Maxtor 300Gb Sony DRU-830A Windows XP Pro SP2 Samsung 215tw 21" Widescreen 
KeyboardPowerCaseMouse
Logitech G15 ThermalTake Toughpower 750W Antec Nine Hundred Logitech MX Revolution 
  hide details  
Reply
post #5 of 5
Using the BIOS's automatic overclocking profiles is one way to overclock your system. However, this is not the most effective way of performing an overclock.

When you set the Automatic overclocking options the BIOS will automatically set all options to maintain stability at those given clock frequencies.

It will increase the VDimm, VCore, VMCH, VICH and VFSB if required. The values it will select are usually higher than what is actually needed. Therefore you may waste electrical energy, and increase temperatures above what is actually required of the system.

Be warned that these profiles are tested with certain Micro-processor configurations, and they may not always work. I suggest you perform your overclocking manually for best results. However using these options is acceptable
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