Overclock.net › Forums › Components › Memory › I'm confused need a good explanation (dividers/timings)
New Posts  All Forums:Forum Nav:

I'm confused need a good explanation (dividers/timings)

post #1 of 6
Thread Starter 
Ok I have a 4:3 fsb:dram setting happening right now. I am showing a freq of 169.1 Mhz in cpu-z my mem is 667mhz sticks. does this mean that my mem is really running at 338.2Mhz or what? is a 4:3 divider good? I am able to overclock farther right now than ever before with a 1:1.

i've read all the faq and quides, and still don't fully understand, sorry(maybe i'm thick in the head)

just an update: Before when I was running 1:1, I couldn't OC any more than 3.56ghz. Now that I'm running a 4:3 divider, I am at 3.74ghz and still climbing.
Blue
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q8200@3.10Ghz/42°c @load GA-EP45-UD3P EVGA GTX260 8GB Kingston HyperX 
Hard DriveOptical DriveOSMonitor
2X500gb SG 7200.12 in raid 0 Sony/Toshiba W7 X64 Samsung 22" LCD 226BW 
KeyboardPowerCaseMouse
G15 Antec 750 CM Stacker 101 (Modded) Sidewinder X8 wireless 
  hide details  
Reply
Blue
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q8200@3.10Ghz/42°c @load GA-EP45-UD3P EVGA GTX260 8GB Kingston HyperX 
Hard DriveOptical DriveOSMonitor
2X500gb SG 7200.12 in raid 0 Sony/Toshiba W7 X64 Samsung 22" LCD 226BW 
KeyboardPowerCaseMouse
G15 Antec 750 CM Stacker 101 (Modded) Sidewinder X8 wireless 
  hide details  
Reply
post #2 of 6
Common Options : 1:1, 3:2, 3:4, 4:5, 5:4

The choice of options in this BIOS feature depends entirely on the setting of the DRAM Ratio H/W Strap or N/B Strap CPU As BIOS feature.
When DRAM Ratio H/W Strap has been set to Low, the available options are 1:1 and 3:4.
When DRAM Ratio H/W Strap has been set to High, the available options are 1:1 and 4:5.
When N/B Strap CPU As has been set to PSB800, the available options are 1:1, 3.2 and 5:4.
When N/B Strap CPU As has been set to PSB533, the available options are 1:1 and 4:5.
When N/B Strap CPU As has been set to PSB400, the only available option is 3:4.
The options of 1:1, 3:2, 3:4 and 4:5 refer to the available CPU-to-DRAM (or CPURAM) ratios.


Note that while the Pentium 4 processor is said to have a 400MHz or 533MHz or 800MHz FSB (front side bus), the front side bus (also known as CPU bus) is actually only running at 100MHz or 133MHz or 200MHz respectively. This is because the Pentium 4 bus is a Quad Data Rate or QDR bus which transfers four times as much data as a single data rate bus.
For marketing reasons, the Pentium 4 bus is labeled as running at 400MHz or 533MHz or 800MHz when it is actually running at only 100MHz, 133MHz and 200MHz respectively. It is important to keep this in mind when setting this BIOS feature.
For example, if you set a 3:2 ratio with a 200MHz (800MHz QDR) CPU bus, the memory bus will run at (200MHz / 3) x 2 = 133MHz or 266MHz DDR.
By default, this BIOS feature is set to By SPD. This allows the chipset to query the SPD (Serial Presence Detect) chip on every memory module and use the appropriate ratio.
It is recommended that you select the ratio that allows you to maximize your memory modules' capabilities. But bear in mind that synchronous operation using the 1:1 ratio is also highly desirable as it allows a high throughput.

THe reason your able to OC higher now with your ratio at 4:3 is because its not trying to push the RAM to such a high frequency as when it was at 1:1, 1:1 means your mem is running at whatever freq that your FSB is, when 4:3 its running 25% less than what it would have been running at 1:1.
My System
(13 items)
 
  
CPUMotherboardOSMonitor
Intel Pentium D 930-C1 ASUS Windows XP Pro w/SP2 Dell 2007 FWP 20" 
KeyboardPowerCaseMouse
Microsoft 650Watt Custom Microsoft Optical 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardOSMonitor
Intel Pentium D 930-C1 ASUS Windows XP Pro w/SP2 Dell 2007 FWP 20" 
KeyboardPowerCaseMouse
Microsoft 650Watt Custom Microsoft Optical 
  hide details  
Reply
post #3 of 6
Thread Starter 
thanks for a good explanation, I now understand the dividers affect on ram. +rep for you my friend.

my ram is 667mhz, but my divider has it running at 167mhz according to what you just told me. Other than changing the multiplier, is there another way to up the memeroy bus? Also does tightening the timings make up for the lower speed?
Blue
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q8200@3.10Ghz/42°c @load GA-EP45-UD3P EVGA GTX260 8GB Kingston HyperX 
Hard DriveOptical DriveOSMonitor
2X500gb SG 7200.12 in raid 0 Sony/Toshiba W7 X64 Samsung 22" LCD 226BW 
KeyboardPowerCaseMouse
G15 Antec 750 CM Stacker 101 (Modded) Sidewinder X8 wireless 
  hide details  
Reply
Blue
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q8200@3.10Ghz/42°c @load GA-EP45-UD3P EVGA GTX260 8GB Kingston HyperX 
Hard DriveOptical DriveOSMonitor
2X500gb SG 7200.12 in raid 0 Sony/Toshiba W7 X64 Samsung 22" LCD 226BW 
KeyboardPowerCaseMouse
G15 Antec 750 CM Stacker 101 (Modded) Sidewinder X8 wireless 
  hide details  
Reply
post #4 of 6
lucid: but doesnt the multiplier indicate that the 133/xxx fsb speed is running how many ever times ur multiplier is set to, so 133x15.1(just example may not be probable) is running 133 15 times giveing the total fsb?
My System
(13 items)
 
  
CPUMotherboardOSMonitor
P4 2.53 L2512 @ 2.94 gigabyte fx-rz xp pro 19" flat crt 
PowerCase
450W generic-modded 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardOSMonitor
P4 2.53 L2512 @ 2.94 gigabyte fx-rz xp pro 19" flat crt 
PowerCase
450W generic-modded 
  hide details  
Reply
post #5 of 6
Quote:
Originally Posted by ptrogen
lucid: but doesnt the multiplier indicate that the 133/xxx fsb speed is running how many ever times ur multiplier is set to, so 133x15.1(just example may not be probable) is running 133 15 times giveing the total fsb?
no the multiplier is for tha cpu, you multiply the FSBxMulti to get final clock speed... like 200fsbx15multi=3ghz
AMD Gamer
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-8320 Asus M5A99FX-Pro MSI GTX980 Gaming Crucial Ballistix 4x4gb 1934mhz @ 8-8-8-24 
Hard DriveCoolingOSMonitor
Samsung Evo 500GB Thermaltake Water 2.0 Windows 10 LG 27" 4k 
PowerCaseMouseMouse Pad
Huntkey X7 900w Thermaltake Urban S31 Logitech G500 Rocketfish Knockoff of Razer propad 
Audio
Logitech Z5500 & G430 
  hide details  
Reply
AMD Gamer
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-8320 Asus M5A99FX-Pro MSI GTX980 Gaming Crucial Ballistix 4x4gb 1934mhz @ 8-8-8-24 
Hard DriveCoolingOSMonitor
Samsung Evo 500GB Thermaltake Water 2.0 Windows 10 LG 27" 4k 
PowerCaseMouseMouse Pad
Huntkey X7 900w Thermaltake Urban S31 Logitech G500 Rocketfish Knockoff of Razer propad 
Audio
Logitech Z5500 & G430 
  hide details  
Reply
post #6 of 6
Quote:
Originally Posted by pbasil1
no the multiplier is for tha cpu, you multiply the FSBxMulti to get final clock speed... like 200fsbx15multi=3ghz
Close... FSB = external clock speed x 4 for P4s. Clock speed = external clock speed x multiplier.
Sig rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 G0 23A Asus P5K Deluxe Wifi HD 3870 2x2 GB G.Skill DDR2-800 
Hard DriveOptical DriveOSMonitor
2x250 GB Seagate RAID 0 + 320 GB Seagate Samsung SATA DVD Windows XP Pro/Vista Ultimate 64 bit Viewsonic VA2012wb 
KeyboardPowerCaseMouse
Saitek Eclipse Corsair HX620 Lian Li V2000b Logitech G7 
  hide details  
Reply
Sig rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 G0 23A Asus P5K Deluxe Wifi HD 3870 2x2 GB G.Skill DDR2-800 
Hard DriveOptical DriveOSMonitor
2x250 GB Seagate RAID 0 + 320 GB Seagate Samsung SATA DVD Windows XP Pro/Vista Ultimate 64 bit Viewsonic VA2012wb 
KeyboardPowerCaseMouse
Saitek Eclipse Corsair HX620 Lian Li V2000b Logitech G7 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Memory
Overclock.net › Forums › Components › Memory › I'm confused need a good explanation (dividers/timings)