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Help with RAM timings

post #1 of 7
Thread Starter 
Im askin here! Im new to this and need advice.


I am running Mushkin EM 5300

http://www.mushkin.com/doc/products/...tail.asp?ID=31

How do i get it up to the advertised 667MHz


I ve messed with the timing and went to 4-4-4-12 and below. Am i going about this the wrong way? I know at 5-5-5-5 tis running at 333khz but the FSB on my proc is 800 in order to get closer to to the 1:1 raitio i need to increase the ram bus speed. ??right?? this would take me to 6-6-6-6-24 i do this and my bios doesnt like it I tried to ratchet up the voltage but still no joy. Im stumped

The Mushkin site says the ram is rated to 2.0v but when i increase the vdimm i can not pass post.
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post #2 of 7
Quote:
Originally Posted by Lurch_Chaos
Im askin here! Im new to this and need advice.


I am running Mushkin EM 5300

http://www.mushkin.com/doc/products/...tail.asp?ID=31

How do i get it up to the advertised 667MHz


I ve messed with the timing and went to 4-4-4-12 and below. Am i going about this the wrong way? I know at 5-5-5-5 tis running at 333khz but the FSB on my proc is 800 in order to get closer to to the 1:1 raitio i need to increase the ram bus speed. ??right?? this would take me to 6-6-6-6-24 i do this and my bios doesnt like it I tried to ratchet up the voltage but still no joy. Im stumped

The Mushkin site says the ram is rated to 2.0v but when i increase the vdimm i can not pass post.
First off, your processor doesn't run at 800, it actually runs at 200. So currently your running your memory faster than your processor, even at 333FSB. You don't want to run DDR2 memory at 1:1, because it defeates the purpose of DDR2 being able to run at a higher bus speed than DDR1.
    
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post #3 of 7
Thread Starter 
I need to increase the ram buss speed to 400 and leave the timings alone right?
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post #4 of 7
OK here is some info you realy need to know. You RAM timeings have a LOT more to do with performance than the speed. For every 30% more speed you get a 1% increase in performance. I didnt believe it so I did a test. I ran Aquamark with 2-2-2-5 RAM timings at 200mhz at got a score of 103,000aquamarks. I then maxed out my RAM timeings to 3-6-6-15 and stayed at 200mhz and I got 84,000 aquamarks. A difference of almost 20%.

Next I clocked my RAM at 257 mhz with 3-3-3-8 and scored 98,000, and at 3-3-3-8 and 200mhz I got 97,000.

I did this test because I was told DDR is actualy better than DDR2. I didnt beleive it so I had to see for myself. All the scores are averaged from 3 tests each and rounded to the nearest 1000. If you dont believe me underclock your RAM and put the timeings as tight as they can go then test. It is better to lower the RAM speed and tighten the timeings than to loosen the timeing to speed it up.

The Most inportant timeings are the CAS Latency, the first number, and the last number the Bank Cycle Time. If you have 1 gig of RAM the Bank Cycle Time is how long it takes the RAM to cycle through one Gig of info. The Cas Latency is how long the RAM has to cool down between cycles. So DDR RAM at 2-2-2-5 actualy does twice the information in the same given amount of time as DDR2 with 4-4-4-12 timeings. What good is shuttling information faster to the rest of your computer if you anly have half as much information to shuttle?

If you dont believe me check it out for yourself. It only takes about 30 min to run all the tests and change the settings.
post #5 of 7
Thread Starter 
I left my timing alone this time and increase just the fsb of my ram to 700 mhz. this brought the timngs to 6-6-6-22. thats going the wrong way Should i leave the FSB at 700 and then decrease the timings? try to move them back down to 4-4-4-12 and below.

Im about to give up on this chip/mobo/ram combo. I have a p4 3.2/motherboard/ram combo laying around. guess i can give that one a shot. Just hope the Proc is not shot.
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post #6 of 7
Get the RAM as high as you can with the 4-4-4-12 timeings. Use dividers on the RAM. People say you get better performance with a 1:1 divider but thats bull as you can see from my tests and you can see for yourself if you test it. The difference in performance between useing 1:1 and not is FAR outweighd by better RAM timeings. Dividers are your friend.
post #7 of 7
Thread Starter 
OK I have a plan of attack thanks to all of ya.

Going to test this weekend after wife gets done with her home work (Ps I fry it she going to have my a**)
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