BobbyFisher
Member
+0|7201
I have 4x 512mb Corsair PC5400UL 3-2-2-8 @ 665 Mhz and 2.1v but while running CPU-Z I saw this

Frequency: 267 Mhz
FSB:DRAM: 3:4
CAS# Latency: 4.0 clocks
RAS# to CAS# Delay: 4 clocks
RAS# Precharge: 4 clocks
Cycle time (TRAS): 12 clocks

How can I lower these timings so that it fits what Corsair promissed.

I know it's in the motherboard settings but what I mean is can I just lower the timings or do I have to adjust frequency also or...
{XpLiCiTxX}
Ohh skeet skeet
+143|6919|New York
I'm not too sure if you can reduce the latency on RAM. I would try overclocking the RAM...that is, depending on your knowledge of that.
RandomSchl
|\/|€|\/|߀|2
+52|6893|California
Your motherboard has to be able to support changing the memory timings, if it can then figure out the rest using GOOGLE, i did that and my RAM works great after lowering the timings.
Mad Ad
Member
+178|6960|England, UK
look for 'set by SPD' or something similar in your bios settings
Twist
Too old to be doing this sh*t
+103|6972|Little blue planet, milky way

BobbyFisher wrote:

I have 4x 512mb Corsair PC5400UL 3-2-2-8 @ 665 Mhz and 2.1v but while running CPU-Z I saw this

Frequency: 267 Mhz
FSB:DRAM: 3:4
CAS# Latency: 4.0 clocks
RAS# to CAS# Delay: 4 clocks
RAS# Precharge: 4 clocks
Cycle time (TRAS): 12 clocks

How can I lower these timings so that it fits what Corsair promissed.

I know it's in the motherboard settings but what I mean is can I just lower the timings or do I have to adjust frequency also or...
Mm... A couple of things wrong, that's for sure. Your bus is running at 266.6 MHz, that's quite normal for an older CPU, so in essense you have bought memory that is a lot faster than you need. This is not unusual. You have to know though, that you MAY not be able to increase the timings to "max" when you run this low a frequency.

Other than that, simply go to your BIOS settings, and set DRAM timings from automatic to manual (whatever this setting is called with your BIOS), and then enter the specs 3-2-2-8 instead of the 4-4-4-12 that you have detected you're using. Be aware of a few things though. There's no guarantee that your board supports these settings, AND there's no gurantee that your memory will be STABLE on a lower CAS setting. Also, if you intend to lower your timings in steps, remember that the Cycle time needs to be a multiple of the precharge (ususally the CAS, but if CAS and precharge are different then the precharge is usually faster, thus this should be used). If you set your timings wrong you may not be able to get windows to start !
BobbyFisher
Member
+0|7201
I went into my bios settings today i tried setting it to the described timings.
But by select manual input over automatic, I have 5 fields to fill out rather than the 4 I expected

DRAM CAS# Latency: 4.0 clocks                     Which I set down to 3 Clocks
DRAM RAS# Precharge: 4 clocks                     Which I set down to 2 Clocks
DRAM RAS# to CAS# Delay: 4 clocks              Which I set down to 2 Clocks
DRAM RAS# Activate to Precharge: 12 clocks   Which I set down to 8 Clocks

And then I have DRAM Write Recovery Time : 4 Clocks (by default)
Other options for this setting are: 2,3 and 5 Clocks
What is this and what do I set it to?

Not knowing what this was I've set everything back the way it was and I'm waiting...

Here are the general specs of my computer:
CPU: Pentium 4 550 3.4 Ghz FSB 800 (some site say it's a 1066 but since mine was advertized at 800 when i bought it that's what i'm gonna say)
Motherboard: Asus P5AD2-Premium
Ram: Already Mentionned

Twist wrote:

Mm... A couple of things wrong, that's for sure. Your bus is running at 266.6 MHz, that's quite normal for an older CPU, so in essense you have bought memory that is a lot faster than you need. This is not unusual. You have to know though, that you MAY not be able to increase the timings to "max" when you run this low a frequency.
Now, granted my cpu is not some cool dual core or quad core slick shit but that comment is just cold. J/k.
Correct me if i'm wrong but my bus is running at 800 Mhz, my FSB is @ 200 with a multiplier of 17 (3.4ghz) and the memory frequency is @ 267.6 thus the 3:4 ratio.

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