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Best OC approach with x6800

post #1 of 5
Thread Starter 
High multiplier/low fsb or low multiplier/high fsb..?

What are the implications of each scenario in terms of performance and ease of overclocking?

For instance, I can get to roughly 3.3 ghz OC two ways:

275 x 12
333 x 10

If I go with the higher multiplier and lower FSB, but I can lower the voltages on "CPU FSB". It will run slightly cooler. But will having a lower FSB w/ higher multiplier hinder preformance? Would running 3.3ghz at 333 x 10 be worth the extra voltage in terms of perforamnce?

If the higher multiplier/lower FSB is the best approached with an unlocked CPU such as the x6800, then to what extremes can I go with the multiplier without hindering CPU performance, which is the entire point of OCing. lol

My specs are in my sig. Thanks in advance.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
x6800 @ 3.33 1.28v EVGA 132-CK-NF78-A1 BFG Geforce 8800 GTX OC 4 GB Corsair PC 6400 XMS2C5 
Hard DriveOSKeyboardPower
160 GB Hitachi SATA & 400 GB Seagate SATA Windows XP / Windows Vista Ultimate Saitek Keyboard BFG 800w PSU 
CaseMouse
Zalman Fata1ity Logitech MX518 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
x6800 @ 3.33 1.28v EVGA 132-CK-NF78-A1 BFG Geforce 8800 GTX OC 4 GB Corsair PC 6400 XMS2C5 
Hard DriveOSKeyboardPower
160 GB Hitachi SATA & 400 GB Seagate SATA Windows XP / Windows Vista Ultimate Saitek Keyboard BFG 800w PSU 
CaseMouse
Zalman Fata1ity Logitech MX518 
  hide details  
Reply
post #2 of 5
You have a motherboard that can unlink the memory speed from the FSB speed, so yes you really do have many options. The higher your FSB, the more "responsive" your system will feel. I'd recommend putting your FSB at 400, leaving your memory Linked & Sync'd, and then decreasing and increasing the multiplier to suit your final clock speed as desired. Also keep in mind the voltage increases when you change multipliers...as you'd be increasing by 400MHz each time, they will be quite substantial voltage changes.
R'lyeh
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q9550 (4.03GHz) Gigabyte EP45-UD3P EVGA GTX285 4GB (2x2) Corsair Dominator (5-5-5-15, 2.1v) 
Hard DriveOptical DriveOSMonitor
300GB WD VelociRaptor, 320GB WD Caviar 7200 Lite-On 20X DVD+R Ubuntu 10.04 x64 / Vista Home Premium x64 Samsung 226BW 
KeyboardPowerCaseMouse
Generic P/S2 Corsair HX750W Lian-Li V2000 Logitech G3 
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R'lyeh
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q9550 (4.03GHz) Gigabyte EP45-UD3P EVGA GTX285 4GB (2x2) Corsair Dominator (5-5-5-15, 2.1v) 
Hard DriveOptical DriveOSMonitor
300GB WD VelociRaptor, 320GB WD Caviar 7200 Lite-On 20X DVD+R Ubuntu 10.04 x64 / Vista Home Premium x64 Samsung 226BW 
KeyboardPowerCaseMouse
Generic P/S2 Corsair HX750W Lian-Li V2000 Logitech G3 
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post #3 of 5
Thread Starter 
Ya if I go any higher than 3.33 ghz I have to essentially up my vcore from 1.28 to 1.35 to keep it stable and my air cooling isn't good enough to keep up with the extra heat that comes with it. I go from high 40's idle to high 50's idle when goin from 1.28v to 1.30v+.

So I'm really lookin for the best setup for 3.33ghz. For now.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
x6800 @ 3.33 1.28v EVGA 132-CK-NF78-A1 BFG Geforce 8800 GTX OC 4 GB Corsair PC 6400 XMS2C5 
Hard DriveOSKeyboardPower
160 GB Hitachi SATA & 400 GB Seagate SATA Windows XP / Windows Vista Ultimate Saitek Keyboard BFG 800w PSU 
CaseMouse
Zalman Fata1ity Logitech MX518 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
x6800 @ 3.33 1.28v EVGA 132-CK-NF78-A1 BFG Geforce 8800 GTX OC 4 GB Corsair PC 6400 XMS2C5 
Hard DriveOSKeyboardPower
160 GB Hitachi SATA & 400 GB Seagate SATA Windows XP / Windows Vista Ultimate Saitek Keyboard BFG 800w PSU 
CaseMouse
Zalman Fata1ity Logitech MX518 
  hide details  
Reply
post #4 of 5
In that case I would run 333 FSB with a 10x multiplier until you get some heftier cooling.
R'lyeh
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q9550 (4.03GHz) Gigabyte EP45-UD3P EVGA GTX285 4GB (2x2) Corsair Dominator (5-5-5-15, 2.1v) 
Hard DriveOptical DriveOSMonitor
300GB WD VelociRaptor, 320GB WD Caviar 7200 Lite-On 20X DVD+R Ubuntu 10.04 x64 / Vista Home Premium x64 Samsung 226BW 
KeyboardPowerCaseMouse
Generic P/S2 Corsair HX750W Lian-Li V2000 Logitech G3 
  hide details  
Reply
R'lyeh
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q9550 (4.03GHz) Gigabyte EP45-UD3P EVGA GTX285 4GB (2x2) Corsair Dominator (5-5-5-15, 2.1v) 
Hard DriveOptical DriveOSMonitor
300GB WD VelociRaptor, 320GB WD Caviar 7200 Lite-On 20X DVD+R Ubuntu 10.04 x64 / Vista Home Premium x64 Samsung 226BW 
KeyboardPowerCaseMouse
Generic P/S2 Corsair HX750W Lian-Li V2000 Logitech G3 
  hide details  
Reply
post #5 of 5
Thread Starter 
rgr thx for the help
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
x6800 @ 3.33 1.28v EVGA 132-CK-NF78-A1 BFG Geforce 8800 GTX OC 4 GB Corsair PC 6400 XMS2C5 
Hard DriveOSKeyboardPower
160 GB Hitachi SATA & 400 GB Seagate SATA Windows XP / Windows Vista Ultimate Saitek Keyboard BFG 800w PSU 
CaseMouse
Zalman Fata1ity Logitech MX518 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
x6800 @ 3.33 1.28v EVGA 132-CK-NF78-A1 BFG Geforce 8800 GTX OC 4 GB Corsair PC 6400 XMS2C5 
Hard DriveOSKeyboardPower
160 GB Hitachi SATA & 400 GB Seagate SATA Windows XP / Windows Vista Ultimate Saitek Keyboard BFG 800w PSU 
CaseMouse
Zalman Fata1ity Logitech MX518 
  hide details  
Reply
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