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memory bandwidth

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liftedcj7on44s

Member
Joined
Oct 6, 2005
Location
Fayetteville N.C.
ok so i have got my amd athlon 64 3200+ at 2500mhz stable using a multi of 250x10 and a htt multi of 3x
my concern is that my memory bandwidth is low. the ram is 1024mb of pc2700. i was hitting a wall trying to get to 2500mhz so i set the divider to 200 for the ram and went from 200mhz in cpu-z down to 125mhz. what can i do to regain some of the bandwidth. atleast to 150mhz if the memory will allow? here are some screenies.
 

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Running pc2700 ram is not the greatest thing on an A64, but running at 125MHz with a divider is a total disaster. Why do you have the divider set in such a way. The divider is there to try and keep your ram at a speed it can run without errors. Your ram should be able to run at 166MHz, so set the divider to keep it close to the speed. You are using a 1:2 divider. Have you tried a 2:3 divider. That would put your ram at about 170MHz. Also, I would look into getting some pc3200.
 
ram

so what you are saying is set it up to 266mhz in the bios? i tried that and it wouldnt post, maybe i need to up the voltage? im dont really understand the whole divider thing.
 
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What is confusing is how each mobo sets up divider controls in their bios differently. In my bios if I set the max mem clock at 200 that's 1:1. set at 166 it's 5:6, set at 133 it's 2:3. In yours it sounds like these numbers are doubled to reflect the double data rate of DDR ram, so 400 = 1:1, 333=5:6, 266=2:3 and 200=1:2. If that's the case then you should set it at 266 and either up your vdimm or loosen your Cas Latency from 2.5 to 3.
 
ok so here what happened
changed to 266 upped v to 2.5volts=no post
changed it from 2.5 to 3 on cas latency=no post
changed it from 1t back to 2t=posted but then immediate restart
changed it back to 2.5 cas latency and maxed the voltage out and it posted and im back in. but this is going to burn the memory up running that high want it? you think i could change it back from 2t back down to 1t?
 
memory

ok so i tried changing it back to 1t and the bios reset itself back to all stock settings.eeeeerrrrrrrrrrrrrr. but atleast now my bandwidth is back up to 183mhz. oh the voltage was maxed out at 3.0v
 
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183MHz is your ram speed not your bandwidth. I don't know what kinf of ram you have, but if it is 2.5 volts at stock then 3 volts may be too much for a steady diet. See if you can set it at 2.8 volts, CL3 and 1t.

You should really be using memtest86 for this kind of testing as you are in danger of corrupting your windows intallation. If you download and make a boot disk you can then check for errors before booting into Windows.
 
If all else has failed it most definately might be time for some new RAM. If you don't want to break the bank OCZ's got some real good value ram.
 
memory

well i have been wanting to go with some of the new corsair stuff recommended for my board i think its like pc3500 if i am not mistaken. 2x1gb.
i will use this stuff til i get tired of it and ill get the other stuff, also this isnt the processor i am going to be running in the next 2 months. computer was down and i had the new motherboard sitting in my room so i had to go ahead and get a processor so i just got this one. going to get a x2 probably a 3800. so the x2 and the pc3500 should make for a nice setup.
 
Yes, trying to run pc2700 on an A64 is going to slow things down a bit, but not as much as you may think. What is more important is how fast your CPU runs, but by all means invest in some new sticks.
 
memory

well right now i got it confortably clocked to 225x10 httx5 and this seems to be fine, memory speed is at 187mhz. this should be a good enough all around setup with this pc2700.
 
An 64 @ 2.5GHz is nothing to sneeze at. That should definately hold you over till you can get your hands on an X2. Whatever you decide on, GL with it
:) :thup:
 
memory

no i changed it back to 1t and left the voltage at the stock setting. right now i am setup at 2250mhz with cpu voltages stock and memory voltages at stock volts with 1t. 2.5 cas latency. ok here is what i did i set everything back up to the way i had it when i was at 2500mhz on the cpu. ok so here are my bios setting.
htt=250x10 with a cpu multi of 10 and a htt multi of 3=2500mhz with a fsb speed of exactly 1000. Umm????? i think there is my problem with the fsb maxed out a 1000 i cant do anything with my memory correct? so i should change it to 2x htt multi. hmmmm......
ok my memory is set on 200mhz 1t with timings of 2.5 3 3 7. right now my memory speed is back to 125mhz. i dont have a floppy drive so i cant run memtest86. but should i change my htt multi to 2x and then go to 266mhz divider and up the voltage to say 2.7v and see if it will work? also if i open up ai booster it shows 2500mhz and a fsb speed of 1000. but if i let it sit for a minute it will change to 2466.54mhz and a fsb speed of 986.40. cpu-z shows 2500mhz it fluctuates between 2499 to 2500 but which one do i believe? idle temps are at 34c and load temp seem to stop at around 47c
 
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