maybe you need to get a better HSF
P4 Northwood vs Prescott GUIDE, P4 "C" vs P4 "E"
P4 Northwood vs Prescott GUIDE, P4 "C" vs P4 "E"
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Apr 11 2004, 08:01 PM
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Senior Member
3,107 posts Joined: Jan 2003 From: Subang |
maybe you need to get a better HSF
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Apr 11 2004, 08:51 PM
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VIP
2,068 posts Joined: Jan 2003 From: Ipoh / Penang / PJ |
It's suppose to work well with stock settings. Anyway, plannng to buy a huge table fan and blow straight into it.
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Apr 12 2004, 06:11 PM
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Senior Member
4,060 posts Joined: Jan 2003 From: Penang / PJ |
The power of 100Watt ++ CPU
jarofclay, how u measure your PWM temperature? |
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Apr 12 2004, 06:30 PM
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VIP
2,068 posts Joined: Jan 2003 From: Ipoh / Penang / PJ |
Using CD4's thermal probes and also Abit's mGuru thingy. Normally, I would minus 10C from Abit's readings and it would serve up the correct figure, matching with my CD4 readings.
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Apr 12 2004, 09:37 PM
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Junior Member
398 posts Joined: Jan 2003 |
table fan is good i tell u i'm using one only casing /w side closed-- 48-50c casing /w side opened-- 47-48c table fan blowing straight thru it /w 2 side opened-- 42-44c prescott 2.8e on asus p4p800 old icute casing with 4fan infront which has no inlet hole, 2 exhaust fan which barely can feel it working and stock hsf |
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Apr 20 2004, 04:23 PM
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VIP
2,068 posts Joined: Jan 2003 From: Ipoh / Penang / PJ |
True true, I've used this b4 and it works. |
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Apr 20 2004, 04:35 PM
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Junior Member
367 posts Joined: Jan 2003 From: Boleh Land |
can somebody confirm the L2 cache bus width? 128bit? 256bit?
some one good enough to post a cpu-z image regarding the L2 cache for prescott? |
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Apr 20 2004, 05:10 PM
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Senior Member
1,167 posts Joined: Jan 2003 From: Malaysia |
what is command extension such as MMX, SSE, SSE2,SSE3, 3DNow Pro & AMD64?
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Apr 21 2004, 12:04 AM
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All Stars
19,176 posts Joined: Jan 2003 From: Klang |
Prescott's L2 cache is 128bits only Northwood is 256bits |
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Apr 21 2004, 12:06 AM
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All Stars
19,176 posts Joined: Jan 2003 From: Klang |
Those are mostly feature instructions |
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Apr 21 2004, 12:08 AM
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Senior Member
10,544 posts Joined: Jan 2003 From: GMT +8:00 |
It does not really matter if the bus width is 128bit or 256bit. What is certain is the Prescott's L2 bandwith is HALF of the Northwood's. |
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Apr 21 2004, 12:29 AM
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Senior Member
4,060 posts Joined: Jan 2003 From: Penang / PJ |
Agree. Smaller bus width with sufficient clock speed can have a higher bandwidth compare to larger bus width but paired with low clock speed. Bandwidth = Clock speed x bus width / 8 (unit is Bytes/second) What's important is the bandwidth, which is to carry data from L2 cache into the pipeline. |
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Apr 21 2004, 12:37 AM
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All Stars
19,176 posts Joined: Jan 2003 From: Klang |
Thats what I am talking about....sadly what a drawback it is for the Prescott....
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Apr 21 2004, 09:36 AM
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Senior Member
2,323 posts Joined: Jan 2003 From: Bangi/Serdang/OP Bentley Music |
u can say that again n again...
user... |
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Apr 21 2004, 01:36 PM
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Senior Member
1,868 posts Joined: Jan 2003 |
XBit Lab Aceshardware If prescott's L2 bandwidth is 1/2 of northwood... that would severly cripple the processor... Its not a supprise here that Prescott has a lower bandwidth.. its a design trade off between having large cache or lower latency... This post has been edited by nUtZ`: Apr 21 2004, 01:36 PM |
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Apr 22 2004, 12:11 AM
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Junior Member
398 posts Joined: Jan 2003 |
erm.....
bus width is certainly 256-bits i dun know how to post the picture coz upload size is 100k oni mininum cut here cut there is 1mb and refer to nutz's aceshardware link the bus width of prescott is 256-bits if the bandwidth is half the size of northwood then how is their performance on par? (i know northwood better then prescott, but not THAT much) edit:and ikanayam gogo ar, better change the picture in the first page coz the picture says bus width of prescott is 128-bit oni This post has been edited by Lucifer: Apr 22 2004, 12:12 AM |
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Apr 22 2004, 12:40 AM
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Senior Member
10,544 posts Joined: Jan 2003 From: GMT +8:00 |
I don't know what methods those 2 used, but digit-life's analysis was very complete and measured the useable bandwith of the Prescott's L2 to be half of the Northwood's. It's not exactly half, but it's more or less half. Looks like the bus speed may have been slowed down somehow, like being made to transfer data every other clock instead of every clock or something like that.
Review here: http://www.digit-life.com/articles2/rmma/rmma-p4.html |
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Apr 22 2004, 02:10 AM
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Senior Member
1,868 posts Joined: Jan 2003 |
fishy:
What i believe the problem with the benchmark that gave only 1/2 the real L1-L2 bandwidth is because the new set associativity parameters. Its either the set associativity increased from 4 way to 8 way or the string length increase from 64-bytte to 128-byte in prescott. (I can't really remember). What i'm guessing here is that the data is not aligned properly with the new set assosiativity settings. So don't worry about it... besides the P4 has a write through L1 cache (i.e. writes directly to the main memory, skipping the L2 cache all together). This post has been edited by nUtZ`: Apr 22 2004, 02:11 AM |
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Apr 22 2004, 03:46 AM
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Senior Member
10,544 posts Joined: Jan 2003 From: GMT +8:00 |
Thanks for explaining nUtZ`
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Apr 22 2004, 03:57 AM
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All Stars
19,176 posts Joined: Jan 2003 From: Klang |
Yeah thanks for the explaination NutZ
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