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Question on FSB, RAM and SuperPi

post #1 of 26
Thread Starter 
Hello again,

after successfully OCing my e6420 to 3.2 and having it run for a few months now I got twitchy fingers and experimented around a bit. The results confuse me, alot!

I started with my current setup in my sig. with the settings from test 1.

Test1: FSB 400, RAM 800, Timings 4-4-4-12, Multi 8, SuperPi 16secs.

Test2: FSB 466, RAM 932, Timings 6-6-6-18, Multi 7, SuperPi 17secs.

Test3: FSB 500, RAM 1000, Timings 6-6-6-18, Multi 6, SuperPi 17.5secs.

Test4: FSB 400, RAM 1000, Timings 6-6-6-18, Multi 8, System wont post.

All other settings weren't changed between the three tests.
So I wonder why test2 is slower than test 1, and why test4 wont work even though test3 will. Am i missing something here or has my system gone nuts?
Aren't RAM MHz > RAM timings? And whats the issue with the divider?

All info is really appreciated. Its not like its tragic, since i was just messing around a bit, but i really would like to know where the logic went!
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Happy Sunshine
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post #2 of 26
6-6-6-18 @ 932mhz...***?

Your RAM can do that on 4-4-4-12-4 with 2.2v easy...maybe even less voltage.

You latencies are soooo loose, its ridiculous.

Yes, speed will overcome latency...but not that much latency...holy hell, You need to tighten up your timings there pal...then run the tests again.

*SuperPi, loves the tightest timings possible at the highest speed.
post #3 of 26
Quote:
Originally Posted by CL3P20 View Post
6-6-6-18 @ 932mhz...***?

Your RAM can do that on 4-4-4-12-4 with 2.2v easy...maybe even less voltage.

You latencies are soooo loose, its ridiculous.

Yes, speed will overcome latency...but not that much latency...holy hell, You need to tighten up your timings there pal...then run the tests again.

*SuperPi, loves the tightest timings possible at the highest speed.
May I ask how safe is 2.2v? I have a 140mm fan blowing on my RAM, so heat is that a problem.
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post #4 of 26
Im a amd guy, but with my rigg superpi favors timings alot.

Then again this is a simple guideline wich is'nt perfectly accurate but sends you in the right way:

800Mhz \\ CAS 4 gets me at: 200
932Mhz \\ CAS 6 gets me at: +/- 155

Meaning your latency at 932Mhz put's you at a disadvantage.

As i said i'm a amd so idk about the ram divider
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post #5 of 26
Quote:
Originally Posted by TaiDinh View Post
May I ask how safe is 2.2v? I have a 140mm fan blowing on my RAM, so heat is that a problem.
Would'nt worry too much about the heat.

But those kind of voltages shorten its lifespan by a lot
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post #6 of 26
I run my G.Skills in my sig at 2.3v 24/7...with a fan, they get warm, not hot. I have only ever had VS RAM 'burn' out after years of 'extended voltage'...even then they still worked at their stock clocks, just not with an OC. <- course' I never actively cooled them either, cuz they were so cheap.

If you can pass MemTest on 2.2, try to lower the voltage to 2.15v and see if the RAM passes...thats how I determine the lowest voltage for a stable clock.
post #7 of 26
Thread Starter 
the point though is not that the timings are ultra loose or what my memory can do or the SuperPi timings themselves, but rather when taking the 4 tests together the results confuse alot.

400 FSB + 800 RAM MHz + tight timings > 466FSB + 932 RAm Mhz + (ultra) Loose timings?

The above is what i thought was not the case. Are you saying it is?

Secondly,
if the rams can do 1000Mhz in 1:1, why not in 1:25?
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Happy Sunshine
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post #8 of 26
Quote:
Originally Posted by CL3P20 View Post
I run my G.Skills in my sig at 2.3v 24/7...with a fan, they get warm, not hot. I have only ever had VS RAM 'burn' out after years of 'extended voltage'...even then they still worked at their stock clocks, just not with an OC. <- course' I never actively cooled them either, cuz they were so cheap.

If you can pass MemTest on 2.2, try to lower the voltage to 2.15v and see if the RAM passes...thats how I determine the lowest voltage for a stable clock.
Thanks for the information.

I can't do +0.05v. I can only do 0.1v, 0.2v and so on. =/ I'm going to go try 5-5-5-15 to 4-4-4-12 right now and see how my SuperPi time is affected.
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post #9 of 26
Thread Starter 
Quote:
Originally Posted by tlan View Post
Im a amd guy, but with my rigg superpi favors timings alot.

Then again this is a simple guideline wich is'nt perfectly accurate but sends you in the right way:

800Mhz \\ CAS 4 gets me at: 200
932Mhz \\ CAS 6 gets me at: +/- 155

Meaning your latency at 932Mhz put's you at a disadvantage.

As i said i'm a amd so idk about the ram divider
Well, in my example the divider was still 1:1 in both cases. But the timings do own the MHz so badly? didnt know that
Happy Sunshine
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CPUMotherboardGraphicsRAM
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WinXP 32bit NEC 1970GX Targan 580W PSU Thermaltake Xaser3 
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Happy Sunshine
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post #10 of 26
I get faster results @ 4-4-4-12-4, 800mhz...than with 920mhz @ 4-5-5-15-5

You have to keep the latencies low, until you break 1000mhz..doing that will keep you 'improving' your times...much more latency than that though, and it begins to show quickly.
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