Bottleneck of S5R4
25 Aug 2008 8:13:00 UTC
Topic 193879
(moderation:
This may have asked before, but what is the bottleneck of S5R4?
I have an E4300 and a Q6600.
Is it better for the E4300 (@stock 200MHz FSB) to run the RAM also at 200MHz syncronious to the FSB or is a higher RAM-speed better (runs now at 200/400MHz and is capable of 800MHz). The Q6600 runs @333MHz and the RAM is syncronious at 333/667MHz.
Or is it more important to set the timings as low as possible?
Bottleneck of S5R4
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Tighter timings helps a little, higher memory speed makes a considerable bigger difference.
I tested memory speed impact with the reference wu using GNU/Linux app einstein_S5R4_6.02_i686-pc-linux-gnu_2 on Debian Etch kernel 2.6.18-6-686, running on Pentium Dual Core E2140 at 2.8GHz, X38 chipset at 266MHz strap:
RAM 700MHz, 3-3-3-10
real 6m22.349s
user 6m17.476s
sys 0m1.880s
RAM 1050MHz, 5-5-5-15
real 6m10.065s
user 6m6.139s
sys 0m1.848s
Edit: Did a run with low speed + loose timings:
RAM 700MHz, 5-5-5-15
real 6m23.507s
user 6m19.380s
sys 0m1.124s
Team Philippines
O.K.! Thanks for your
)
O.K.! Thanks for your information.
I doubled the memory speed of my E4300 from 400MHz to 800MHz.
The crunch-time dropped from a little over 16 hours to a little over 15 hours, but than I had a problem with resuming from hibernate, because this ended in an absent result just after the resuming was done.
Don't know why. I adjusted the timings and raised the NB-voltage a little bit.
So, I decided to go back to 400MHz RAM-speed and thats it.
Anyway, how can I measure the crunch time with this reference wu?
Is there a little program, like SETI has or do I have to do this with BOINC?
Edit: I have Windows XP.
RE: O.K.! Thanks for your
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You should check the manufacturers specs for that RAM, maybe it need higher voltage. Depends on timings also, most DDR2 can run 800MHz 5-5-5-15 on stock volts (1.8 for DDR2) but not all. You shouldnt need to up the northbridge voltage unless you got 4 sticks of RAM and/or doing some kind of overclocking, and not even then for many boards.
I dont know how to run the reference WU on Windows, the included script is for linux and mac. I know someone here made windows scripts, lets hope someone can chime in with advice.
Team Philippines
I have the same RAM (OCZ DDR2
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I have the same RAM (OCZ DDR2 800 5-5-5-15) on the E4300 (Asus P5N-E SLI) and on the Q6600 (Asus P5K-E Wifi).
On my Q6600 the RAM runs at 800MHz @ 5-5-5-15 without problems.
But the P5N-E SLI seems to struggle with that. It runs without problems, but resuming from hibernate causes the error.
So, by only adjusting the memory-speed causing the error it has something to do with this.
I will try the black memory-banks and see if this will help, but I thought the yellow ones are better for compatibility and speed.
The colour of slot doesn't
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The colour of slot doesn't mean anything. But the timings of sticks make significant sense. That's why overclocked sticks are more expensive that stock ones. Try to set a pair of overclocked sticks like OCZ (1066 Mhz capable) with heat radiators on it - this will enable you to overclock and use the same time a dual channel capability.
Recently I tested the overclocking on P5K and some other mobos and found that it is better to overclock the CPU than the memory because of instability at higher frequencies even if ASUS says about 1600 Mhz support.
I found that Q6600 and Q6700 can work stable at 3.2 and even at 3.4 Ghz and it makes a single WU on one core for about 7 to 8 hours.
The syncronious mode will not give you anything significant, so it's not an issue.
P.S. I will compare the productivity on Q6600 with DDR3 soon...