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Why P630 beats my overclocked pd 830 in super pi 1M test.

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October 9, 2006 5:44:44 AM

Hello

I am surprised that my brother P4 630 or 640 can finish super pi 1M test in 35s without overclocking. I can only go par with him when i overclock my pd830 to 3.6ghz. I am really surprised.

I have tried to test with a single core on my machine , but the result is the same. I have 2 gig of rams and he has only 1.5. i do not have a clue. Do you guys know why?


Thanks.
October 9, 2006 5:48:40 PM

the p4 630 and pd805 are using the same microarchitecture which so called netburst. in netburst, the clockspeed rules, thus p4 630 3ghz overperformed pd805 2.66ghz, eventhough the pd 805 is a dual core processor, the p4 630 is aslo hyperthreading (dual core virtually).

beside the cpu, the super pi application really depends on the memory frequency and timing too. perhaps your brother ram/memory was performing a bit faster than yours regarding dual channel is a bit slower than single channel but dual channel's bandwidth is double than single channel's bandwidth.

i take 55s with super pi 2m using e6600 & 2gb dual channel ddr400 3-3-3-8 2T timing, and 53s with the same cpu but 2gb dual channel ddr400 2.5-3-2-5 2T timing. there's a 2s vary.
October 9, 2006 6:39:22 PM

SuperPI is not multi-threaded, iirc.
So using a dual core CPU, only one processor is benchmarked.
So your 830 would run SuperPI at about the same speed if you overclocked it to the same MHz of your brothers P4-640
October 9, 2006 6:41:54 PM

Quote:
the p4 630 and pd805 are using the same microarchitecture which so called netburst. in netburst, the clockspeed rules, thus p4 630 3ghz overperformed pd805 2.66ghz, eventhough the pd 805 is a dual core processor, the p4 630 is aslo hyperthreading (dual core virtually).

beside the cpu, the super pi application really depends on the memory frequency and timing too. perhaps your brother ram/memory was performing a bit faster than yours regarding dual channel is a bit slower than single channel but dual channel's bandwidth is double than single channel's bandwidth.

i take 55s with super pi 2m using e6600 & 2gb dual channel ddr400 3-3-3-8 2T timing, and 53s with the same cpu but 2gb dual channel ddr400 2.5-3-2-5 2T timing. there's a 2s vary.
Chrone...you're correct about which you speak, but he is comparing P4 630 vs P830D(not 805D). In response to OP's question, 35s is pretty quick for a stock 630....are you sure he isn't overclocked too? As Chrone suggested, memory speed/timings may be faster, and even some motherboards perform poorly, and some are awesome(chipset). Lastly, OS optimization can get you faster times as well, and he may have his system tweaked nicely. There are a lot of variables that can affect benchmarks/application performance. :wink:
Anonymous
a b à CPUs
a b K Overclocking
October 9, 2006 8:10:20 PM

Hang on xtremesystems.org for a while and you'll pickup some tweaks and beat him!

3 thing I see, 1st, maybe his OS is "cleaner" or tweaked a bit.

Another thing I remeber reading, is that for optimal performance, you should let SPI use only 512 meg, I think there's a switch or some function for that. Maybe his 1.5 gig is actually helping since there's less memory allocation to be done!

Optimatlly 2 gig with the "512 switch" should yield the fatest time!

Finally chipset DOES play an important role in SPI, properly cooled chipset wiht better memory controller can change a lot, the CPU is not the only factor!
October 9, 2006 8:28:47 PM

35 seconds is a very good time; I have a hard time beleiving that your brother's P4 isn't overclocked.
October 9, 2006 8:29:13 PM

Ever since upgrading my P4 2.66/533 to P4 3.00/800FSB the change isn't drastic for me (1M 19 iterations).

P4 2.66 - 1 min 06 sec
P4 2.66@2.960 - 57 sec.

P4 3.0 - 50 sec.

I've seen allot of other systems put mine to shame, but hay, this makes me feel allot better:

Quote:
This record-breaking program was ported to personal computer environment
such as Windows NT and Windows 95. In order to calculate 33.55 million
digits, it takes within 3 days with Pentium 90MHz, 40MB main memory and
340MB available storage.


:lol: 
Anonymous
a b à CPUs
a b K Overclocking
October 9, 2006 8:31:15 PM

Lol we're at 14 min now! hehe
October 9, 2006 8:42:24 PM

Quote:
35 seconds is a very good time; I have a hard time beleiving that your brother's P4 isn't overclocked.


yes, being that i have one, use it every day, and also OC alot with it.

1st off its a fact that an un OC'd p630 does 1m in exactly 40 seconds. maybe 39 secs with tight ram.

juging by his 1m time id say hes got it around 3.3~3.4ghz. and hes pulling your leg.

you have the same core architexture that he does, thats why you have to take it to 3.6 to compete (probably what his is at), the only difference with your cpu is you can run 2 instances of superpi and get the same time, when hes running only one.
October 10, 2006 1:04:12 AM

oops my bad, i hardly saw the Pentium D 830. i'm sorry.. :oops: 
!