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Ram Bandwidth @ 200Bclk (i3 + Asus P7H55)

 
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post #1 of 6 (permalink) Old 03-10-2011, 12:08 PM - Thread Starter
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When my Asus P7H55 is clocked at 200Bclk, the ram memory bandwidth drops.

Sandra: average memory bandwidth drops to less than 1/2
Maxxmem2: average memory bandwidth drops to 3/4

For Bclk > 200, bandwidth slowly increases starting at the 200Bclk bandwidth amount. But It never again comes close to reaching the 199Bclk bandwith.

Also, notice that memory latency is not adversely affected. Could my motherboard or cpu have switched to single channel mode?
maxxmem2 and cpu-z both show "dual symmetric channel" at 200Bclk.
I dont understand what is happening.

Anyone else experience this on their core i3/i5/i7 systems??
For gaming, is it better to limit my Bclk to 199?
Or is the extra ram bandwidth not really needed (for games)?
Can this be fixed?






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post #2 of 6 (permalink) Old 03-11-2011, 05:10 AM
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Try lowering your QPI multiplier.

My Subzero Runs Thread
^^ Updated 11/04/10


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post #3 of 6 (permalink) Old 03-11-2011, 06:29 AM - Thread Starter
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I just tried QPI at the middle speed (3600MHz). Same problem at 200 Bclk.
I will try other QPI multipliers too, right now.

Here's something I noticied. At 200 Bclk, maxxmem2 needs about 3 more seconds to finish benching. What could cause that?

Should I put the ram into the other slots?

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post #4 of 6 (permalink) Old 03-11-2011, 06:32 AM
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Quote:
Originally Posted by Partol View Post
I just tried QPI at the middle speed (3600MHz). Same problem at 200 Bclk.
I will try other QPI multipliers too, right now.

Here's something I noticied. At 200 Bclk, maxxmem2 needs about 3 more seconds to finish benching. What could cause that?

Should I put the ram into the other slots?
No, that shouldn't be it. My guess is your motherboard is changing settings to account for the higher BCLK. Could be memory sub-timings, something related to QPI...

My first guess would be it's lowering a couple settings to account for the high QPI you have.

My Subzero Runs Thread
^^ Updated 11/04/10


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post #5 of 6 (permalink) Old 03-11-2011, 06:54 AM - Thread Starter
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I set ram to 1333MHz and bandwidth increased at 200 Bclk. Seems I must run ram at 1333 for Bclk greater than 200 if I want high bandwidth.
This will be a difficult decision.

1333 and high ram bandwidth? or 1600 and low ram bandwidth? which is better for gaming?

Thanks for helping.

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post #6 of 6 (permalink) Old 03-11-2011, 07:09 AM
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Quote:
Originally Posted by Partol View Post
I set ram to 1333MHz and bandwidth increased at 200 Bclk. Seems I must run ram at 1333 for Bclk greater than 200 if I want high bandwidth.
This will be a difficult decision.

1333 and high ram bandwidth? or 1600 and low ram bandwidth? which is better for gaming?

Thanks for helping.
In the end it'll make little to no difference in gaming. Try running SuperPi 32M on each of those settings. I'd go with whatever has a lower time.

My Subzero Runs Thread
^^ Updated 11/04/10


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