Overclock.net › Forums › AMD › AMD Motherboards › Ratio questions
New Posts  All Forums:Forum Nav:

Ratio questions

post #1 of 3
Thread Starter 
Hey guys,

Ok, am I right if i say when I run my CPU and memory at stock, it's running a 2:1 ratio? 12:6 = 2:1 right? So now, I've got my FSB at 300 and my CPU multi at 9. That means it's now at 9:7 right? Is that an "OK" ratio to run? Should I tighten some timings and see what happens? If so, which ones should I tighten?

Soz for all the questions and thanks for helping!
    
CPUMotherboardGraphicsRAM
Intel 2500K @ 4.0GHz Gigabyte Z68P-DS3 Gigabyte GTX 780 Corsair Vengeance LP DDR3 2GB x4 
Hard DriveCoolingOSMonitor
Corsair Neutron GTX 120GB Corsair H80 Windows 8.1 64-Bit Samsung S27C750P 
KeyboardPowerCaseMouse
Logitech G15 Coolermaster 800W Corsair Obsidian 750D Razer Deathadder 2014 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Intel 2500K @ 4.0GHz Gigabyte Z68P-DS3 Gigabyte GTX 780 Corsair Vengeance LP DDR3 2GB x4 
Hard DriveCoolingOSMonitor
Corsair Neutron GTX 120GB Corsair H80 Windows 8.1 64-Bit Samsung S27C750P 
KeyboardPowerCaseMouse
Logitech G15 Coolermaster 800W Corsair Obsidian 750D Razer Deathadder 2014 
  hide details  
Reply
post #2 of 3
Ratios are pretty meaningless for AMD X2. The "FSB" is actually the reference clock. FSB is an Intel term, and on Intel systems data is transferred on the FSB and ratios with the memory are important. For AMD, the reference clock is the number that starts at 200MHz and you increase it to overclock the computer. It's just a number, it's not a bus. No data flows on the reference clock. So it doesn't matter what you run it at.

The CPU and HT Link reference this "reference clock" to calculate their speeds. For example, at stock, you might have CPU = 200MHz x 10 = 2GHz, and HT Link = 200MHz x 5 = 1000MHz. As you overclock the reference clock, both the HT Link and CPU speed go up. Overclocking the HT Link in theory does absolutely nothing as even at 1000MHz it's not fully utilized (think a 5 lane highway with 3 cars on it... add a 6th lane and the traffic isn't going to move any faster). But increasing the reference clock speeds up the CPU which is great, the more CPU speed the better.

But your question was on ratios. Well, turns out the memory references the CPU, not the reference clock, when calculating it's speed. Memory speed = (CPU speed)/divider. The divider depends on the memory setting (i.e. DDR2 800, DDR2 667, etc) and the CPU multiplier. You can read more about that here. And since no data is moved on the reference clock, it really doesn't matter at all what the ratio of the memory's speed is to the reference clock.

Just get the most CPU speed you possibly can, run the memory at DDR2 800 (if possible, if not, go DDR2 667) and tighten the timings as much as you can! Good luck!
White Whale
(14 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7-4770K Gigabyte GA-Z87X-UD4H MSI TwinFrozrIII 7950 2x8GB Crucial Ballistix Sport XT 
Hard DriveCoolingOSMonitor
250GB Samsung Evo Noctua NH-D14 Windows 7 Professional 64-bit 24" Samsung ToC T240 1920x1200 
KeyboardPowerCaseMouse
Saitek Eclipse (Blue LED) 660W Seasonic Platinum SS-660XP Corsair 600T (white) OCZ Equalizer 
Mouse Pad
XTrac Ripper 17" x 12" 
  hide details  
Reply
White Whale
(14 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7-4770K Gigabyte GA-Z87X-UD4H MSI TwinFrozrIII 7950 2x8GB Crucial Ballistix Sport XT 
Hard DriveCoolingOSMonitor
250GB Samsung Evo Noctua NH-D14 Windows 7 Professional 64-bit 24" Samsung ToC T240 1920x1200 
KeyboardPowerCaseMouse
Saitek Eclipse (Blue LED) 660W Seasonic Platinum SS-660XP Corsair 600T (white) OCZ Equalizer 
Mouse Pad
XTrac Ripper 17" x 12" 
  hide details  
Reply
post #3 of 3
Thread Starter 
Thanks for the info, helped alot!
    
CPUMotherboardGraphicsRAM
Intel 2500K @ 4.0GHz Gigabyte Z68P-DS3 Gigabyte GTX 780 Corsair Vengeance LP DDR3 2GB x4 
Hard DriveCoolingOSMonitor
Corsair Neutron GTX 120GB Corsair H80 Windows 8.1 64-Bit Samsung S27C750P 
KeyboardPowerCaseMouse
Logitech G15 Coolermaster 800W Corsair Obsidian 750D Razer Deathadder 2014 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Intel 2500K @ 4.0GHz Gigabyte Z68P-DS3 Gigabyte GTX 780 Corsair Vengeance LP DDR3 2GB x4 
Hard DriveCoolingOSMonitor
Corsair Neutron GTX 120GB Corsair H80 Windows 8.1 64-Bit Samsung S27C750P 
KeyboardPowerCaseMouse
Logitech G15 Coolermaster 800W Corsair Obsidian 750D Razer Deathadder 2014 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD Motherboards
Overclock.net › Forums › AMD › AMD Motherboards › Ratio questions