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Old 01-08-2005, 08:10 PM   #1
trans am
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CPU: A64 Ram Divider Training Guide and overclocking tips(newbies Please Read!!)

Here's a handy guide I wrote with an enclosed tool to help calculate different ram speeds and cpu clock speeds using different memory dividers and multi's. Big thanks to goddh0r for writing A64 MemFreq 1.1 Program!


A ram divider is usually a setting found in your ram tweaking setting menu in your bios. dividers usually are 200(1:1), 166, 150, 133, 100 or 400, 333, 266, 200. etc..
The lower you go on the divider, the less ram speed is used. The whole point of a divider is if your memory can't keep up with your fsb. say you have an a64 3200+ that does 2.5 ghz. you would normally do 250x10 ram 1:1 (ram 250 also) 1:1 HTT=ram speed 250=250.

but in your case you have ram that won't do 250mhz, so you need to use a divider. Download this zip file and type the HTT(fsb) in the top line and go from there. This will help you find your sweet spot. You can use it to help calculate your ram speed and total cpu clock by using different dividers and cpu muti's. AMD64 multi's are unlocked downwards. so if you have default multi of 10, then you can use 9, 8, 7, 6, 5, don't go below 5. In the case of an FX, the multi is unlocked both ways.
Just think of your cpu max clock and your ram's max clock and find the best way to utilize the most from each.

ex. Joe has an athlon 64 that does 2.53 ghz. stable. but his bh6 ram only goes up to 232mhz at 2-2-2-6 1T. what does Joe do? he does this: set's the cpu multi at 9. sets ram divider at 166. sets his HTT(fsb) at 280. bingo! Joe's cpu is now doing 2.52ghz(9*200) and his ram is doing 229mhz!

Here's another example: Steve just shelled out $250 on some new TCCD that does 284mhz at 2.5-3-3-7 1T. He has a crappy 3500+ that only does 2.58 ghz. Steve assumes that because his cpu only does 258x10, his ram will have to run at 258 too. But Steve wants to use all that bandwidth of his tccd, but doesn't want to go over his cpu speed. So what does Steve do?
Steve set's his multi to 9 and runs his ram up to 284 1:1. Now his cpu is at 2.55(9x284) and his ram is ripping at 284mhz like it should! Steve is very happy and he is glad he spent the money on his new ram.

GENERAL RULES ON A64:
Remember, never use .5 multis.
never use multi under 5.
For best performance use 1T command setting(I've found 2T command is about the equivalent to a 20mhz loss in memory performance)

IMPORTANT!!!
Depending on your A64 chipset your total HTT(fsb) and HT multi(2x, 3x, 4x, etc.) should never exceed the total hyper transport link speed. ex. NF3 250 ultra has max of 1000mhz hyper transport link. So if fsb is 290 and htt is at 5x(200*5=1000) 5x290=1450 BAD!!!
to fix. just lower the HT multi(hyper transport Link) to 3x(200*3=600) so 3*290=870 total hyper transport speed. GOOD! you kept it under 1000!


In the attached zip file. enter your fsb(htt) in the First line at the top.
Attached Files
File Type: zip a64 memory divider helper.zip (10.9 KB, 7477 views)
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Last edited by trans am; 01-27-2005 at 06:55 PM.
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Old 01-09-2005, 04:28 PM   #2
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Quote:
Originally Posted by Duedermont
found some stuff pretty useful but you should be more thorough on this part and tell how by setting it to a 166 divider his ram will do 229mhz. show the math man!
lol that's what the file I attached is for. So you don't have to do the math. That was the whole point. Takes the lengthy calculations out so you can find your sweet spot faster. It is a pain in the butt to do the lengthy equasion. different multi with different dividers = different final mem clock.. look.

If there is a math genius on eocf that wants to explain this, please be my guest. I was never good at math, more of a creative type personally.
Attached Thumbnails
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Name:	multi8 166.JPG
Views:	2569
Size:	22.0 KB
ID:	56200   Click image for larger version

Name:	multi 9 166.JPG
Views:	1662
Size:	22.0 KB
ID:	56201  
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Old 01-10-2005, 03:59 PM   #3
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i got a question
why is it so bad to run the hyper transport Link at higher htt will it fry the board,cpu or the ram i have mine 275 htt 4 @ 1100 will that kill my rig

P.S was it ok to ask a guestion here
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Last edited by turbo098; 02-28-2005 at 11:24 AM.
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Old 01-10-2005, 05:38 PM   #4
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Well flooding the htt link will usually result in lower cpu overclock and unstable performance. for maximum cpu overclock make sure it's under your chipsets total rated htt link specs. GOing over won't damage anything so you should be fine if it's stable.
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Old 01-10-2005, 05:50 PM   #5
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Great job that program is awesome lol saves me from thinking
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Old 01-21-2005, 03:14 PM   #6
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Quote:
Originally Posted by hashi
Great job that program is awesome lol saves me from thinking
Me too, this is great, I'm already writing steps down to take when I get my FX-55 setup
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Old 01-30-2005, 03:17 PM   #7
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nice work....thanks.
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Old 02-01-2005, 01:31 PM   #8
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I've got a question. I know using .5 CPU multis have never been popular. But it would be really handy for me to use one. Can you explain why exactly it it discouraged to use .5 multis?
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Old 02-01-2005, 02:02 PM   #9
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Well ,actually .5 multis are not always bad. basically you just want to run your memory as high as it will go at the tightest timings possible at 1T. The whole point is some think a .5 multi equals .5, but it doesn't and they are very misleading. But for those who are aware of the speed they are actually at with a .5 multi and it helps you obtain what you want form your ram then more power to you.
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Old 02-01-2005, 04:01 PM   #10
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oh kick wholelotta bootie! definitely should help out a newb to overclocking like muah!
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Old 02-01-2005, 04:03 PM   #11
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Great Job!

Thanks
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Old 02-03-2005, 10:34 AM   #12
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Funny description, good guide. You should explain why they shouldn't use the half-multis.

I just want to know a few important questions: is Joe gay? What happened to Jane?
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Old 02-03-2005, 10:46 AM   #13
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well using the A64 MemFreq 1.1 Try running a .5 multi and see what I mean. I guess you could use a .5 multi as an optional memory divider.
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Old 02-04-2005, 11:38 AM   #14
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ram question

thank you very much for that tutorial it was of great help to me and others.
my question is why cant my system startup with memory timing T1.

system specs:

amd 64 3200+ 1mb l2 cache
epox 250 nfs 3 mobo

512 ddr elixir memory
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Old 02-07-2005, 09:42 AM   #15
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Make sure you have them in the proper DIMM's. Check your MB guide, and see what it says certain modules should be in what slots, as far as double and single sided chips for DC mode.
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Old 02-08-2005, 11:58 AM   #16
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Thumbs up

I'm a newbie and this post helped a lot. Thank you for your effort.

Quote:
IMPORTANT!!! Depending on your A64 chipset your total HTT(fsb) and HT multi(2x, 3x, 4x, etc.) should never exceed the total hyper transport link speed. ex. NF3 250 ultra has max of 1000mhz hyper transport link. So if fsb is 290 and htt is at 5x(200*5=1000) 5x290=1450 BAD!!! to fix. just lower the HT multi(hyper transport Link) to 3x(200*3=600) so 3*290=870 total hyper transport speed. GOOD! you kept it under 1000!
Q) Does lowering the HT multiplier decrease performance in any way? Or is it that as long as the CPU and RAM are running as close to their maximums as possible that maximum performance will be achieved?

Thanks,

roopurt18
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Old 02-08-2005, 06:04 PM   #17
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Edit: Come to think about it, the guide would be better if it explained the math of it all, but since it does accomplish something and is free I can't really complain

Last edited by Czarspuppet; 02-13-2005 at 05:52 PM.
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Old 02-08-2005, 06:10 PM   #18
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This is a bad guide..

From my knowledge, EVERYTHING to do with overclocking is basic algebra, except for SOME heat and delta heat (H') equations dealing with heat loss over an area.. Or am I wrong?
you must have very limited knowledge then... what's the quote trans_am, I remember it in the thread that you posted about the g-unit g-skill ad campaign that everyone was a grouch about... somehting like "overclocking is throwing several paychecks in to a box and praying"

overclocking is not linear.. YMMV, meaning, your mileage may vary, it is definitely not algebra

ah here it is..
Quote:
OVERCLOCKING - The process of installing high hopes, dumb luck, and several paychecks into a rectangular box which transmits a signal to a screen that displays your fate. The outcome is usually depressing.
Thanks for the guide trans... I've pretty much mastered overclocking P4s but it looks like A64s are a little bit more tricky and I know I'm going to have to refer back to this when I get all my stuff together
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Old 02-09-2005, 09:41 PM   #19
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Originally Posted by Topher
you must have very limited knowledge then... what's the quote trans_am, I remember it in the thread that you posted about the g-unit g-skill ad campaign that everyone was a grouch about... somehting like "overclocking is throwing several paychecks in to a box and praying"

overclocking is not linear.. YMMV, meaning, your mileage may vary, it is definitely not algebra
So, Because overclocking is unpredictable and "it is definitely not algebra", there is no algebraic formula for the memory divider? Does this little 36kb program provided have 2^80+ predetermined results stored in it? Theres a formula..

Its what my calculus teacher taught me.. You can always punch various numbers into some calculator application and try to get a result you want.. or you can take a formula and put in the result you want and work it backwards to get ALL possible variables that would give the number you want..

Quote:
OVERCLOCKING - The process of installing high hopes, dumb luck, and several paychecks into a rectangular box which transmits a signal to a screen that displays your fate. The outcome is usually depressing.
I got a 41% overclock my first day at 9C, wasn't depressed at all
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Old 02-10-2005, 05:03 AM   #20
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I got a 41% overclock my first day at 9C, wasn't depressed at all
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