Hey everyone...
I currently have a pair (2X512) of Corsair Value-select 3200 (400) ram installed running in dual channel on an Asus P4P800 SE. The timings on it are (2.5) (3) (3) (8) at 200MHZ. I currently bought from someone a pair of Corsair TwinX (2X512) 32002PT which I also installed. But when I load up Everest it shows 3 different timing for 3 different speeds.
@200MHZ (3.0) (3) (3) (8)
@166MHZ (2.5) (3) (3) (7)
@133MHZ (2.0) (2) (2) (6)
My original memory only shows one set of timings mentioned above. Why does Everest show 3 different settings and which one is the actual setting. Or is it showing that because those are the possible settings available for this memory? Do I need to change my latencies for the new memory to match the original running at 200MHZ? To tell you the truth, I didn't notice any significant speed change after installing the additional Gig of memory. Is it because I'm using memory with different timings even though the size and speed are the same? I did try googling this but was overwhelmed with too much info. Please help! Thanks...Also, according to CPU-Z, my bus speed on my CPU is at 133MhZ with a multiplier of 18 (it's a P4 Prescott 2.4A). Do I need to change that to match my RAM speed (currently running at 200MhZ)? I cannot not change my multiplier as it is locked! Thanks again...

Those settings are "SPD" timings (Serial Presence Detect) wich are programmed in to a little chip on every stick of DDR1 or DDR2.


When you plug memory into the motherboard, the BIOS will look at these settings and set them automatically for you.


With Intel...your FSB and Memory speeds may not necesarily be "Synchronized"

Your FSB is 133, but Intel uses a "Quad Pump" (133x4x) so your rated FSB will show up as 533MHZ

Your memory speed is 200x4=800MHZ

If you try to make your FSB 200MHZ, with your 18x Multiplier..it will give you a CPU speed of 3.6GHZ! (Wich is probably too high)

This will also raise you memory speeds way to much unless you change the ram "Multiplier" it uses now (Probably something like 4:5) to 1:1.

Modern Core 2 Duo's (1066 FSB) use a ram "Divider" of something like 5:4, so the ram speed stays at 800MHZ.

Almost all computers use these ratios, but not al motherboards allow you acces in the bios settingsto fidlle with them.

Overall best performance comes at a 1:1 ratio, sometimes reffered to as "Linked" or "In Synch"

So if you OC the FSB, you will probably need to adjust the ram ratio to keep the memory near 800MHZ, "Value Ram" like yours often won't go very far above stock (Maybe 850MHZ)

If your motherboard has acces to FSB, voltage settings and ram ratio's, I would try and and raise the FSB to 166-200MHZ, if your cooling and power supply are of good quality..those little 2.4 prescotts clock up realy nice...typically around 3GHZ at stock voltage!
(They run very hot at stock..and boil when OC'd with extra voltage, so your cooling has to be top notch!)

Just remember to raise the FSB slowly...5MHZ increments at first (Try 133-138-143..etc, or 135-140-145,etc, if you like to keep the numbers easy) and then run a stabilty test after each change (Prime 95 or OCCT) and then 2MHZ increments to "Fine tune" it.

There are some other settings that might need adjustment along the way, but those kinds of details are kinda involved for this 1 reply....they could include North Bridge voltage, Ram voltage..etc, just leave the voltages at stock for now and see how far you get.

I would google up some reviews of your motherboard and see how far they were able to get FSB wise, good reviews will include pics of the bios, and sometimes even tell you what final settings and voltages they used for there Overclock.

Quote: Originally Posted by $SOLID$ Necro Those settings are "SPD" timings (Serial Presence Detect) wich are programmed in to a little chip on every stick of DDR1 or DDR2. When you plug memory into the motherboard, the BIOS will look at these settings and set them automatically for you. With Intel...your FSB and Memory speeds may not necesarily be "Synchronized" Your FSB is 133, but Intel uses a "Quad Pump" (133x4x) so your rated FSB will show up as 533MHZ Your memory speed is 200x4=800MHZ If you try to make your FSB 200MHZ, with your 18x Multiplier..it will give you a CPU speed of 3.6GHZ! (Wich is probably too high) This will also raise you memory speeds way to much unless you change the ram "Multiplier" it uses now (Probably something like 4:5) to 1:1. Modern Core 2 Duo's (1066 FSB) use a ram "Divider" of something like 5:4, so the ram speed stays at 800MHZ. Almost all computers use these ratios, but not al motherboards allow you acces in the bios settingsto fidlle with them. Overall best performance comes at a 1:1 ratio, sometimes reffered to as "Linked" or "In Synch" So if you OC the FSB, you will probably need to adjust the ram ratio to keep the memory near 800MHZ, "Value Ram" like yours often won't go very far above stock (Maybe 850MHZ) If your motherboard has acces to FSB, voltage settings and ram ratio's, I would try and and raise the FSB to 166-200MHZ, if your cooling and power supply are of good quality..those little 2.4 prescotts clock up realy nice...typically around 3GHZ at stock voltage! (They run very hot at stock..and boil when OC'd with extra voltage, so your cooling has to be top notch!) Just remember to raise the FSB slowly...5MHZ increments at first (Try 133-138-143..etc, or 135-140-145,etc, if you like to keep the numbers easy) and then run a stabilty test after each change (Prime 95 or OCCT) and then 2MHZ increments to "Fine tune" it. There are some other settings that might need adjustment along the way, but those kinds of details are kinda involved for this 1 reply....they could include North Bridge voltage, Ram voltage..etc, just leave the voltages at stock for now and see how far you get. I would google up some reviews of your motherboard and see how far they were able to get FSB wise, good reviews will include pics of the bios, and sometimes even tell you what final settings and voltages they used for there Overclock.

Wow!...that was a wealth of info...thanks Necro!...I'm gonna research some more on my mobo and see what I can do...