Welcome Guest ( Log In | Register )

6 Pages < 1 2 3 4 5 > » Bottom

Outline · [ Standard ] · Linear+

 P4 Northwood vs Prescott GUIDE, P4 "C" vs P4 "E"

views
     
DrJackal
post Apr 11 2004, 08:01 PM

-
*******
Senior Member
3,107 posts

Joined: Jan 2003
From: Subang
maybe you need to get a better HSF
jarofclay
post Apr 11 2004, 08:51 PM

Klipsch Addict
Group Icon
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. wink.gif
charge-n-go
post Apr 12 2004, 06:11 PM

Look at all my stars!!
*******
Senior Member
4,060 posts

Joined: Jan 2003
From: Penang / PJ

The power of 100Watt ++ CPU tongue.gif

jarofclay, how u measure your PWM temperature?
jarofclay
post Apr 12 2004, 06:30 PM

Klipsch Addict
Group Icon
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.
Lucifer
post Apr 12 2004, 09:37 PM

Casual
***
Junior Member
398 posts

Joined: Jan 2003
QUOTE (jarofclay @ Apr 11 2004, 08:51 PM)
It's suppose to work well with stock settings. Anyway, plannng to buy a huge table fan and blow straight into it. wink.gif

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
jarofclay
post Apr 20 2004, 04:23 PM

Klipsch Addict
Group Icon
VIP
2,068 posts

Joined: Jan 2003
From: Ipoh / Penang / PJ


QUOTE (Lucifer @ Apr 12 2004, 09:37 PM)
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

True true, I've used this b4 and it works.
TaiZi@CCF
post Apr 20 2004, 04:35 PM

Casual
***
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?
computer idiot
post Apr 20 2004, 05:10 PM

R2904/700005
******
Senior Member
1,167 posts

Joined: Jan 2003
From: Malaysia


what is command extension such as MMX, SSE, SSE2,SSE3, 3DNow Pro & AMD64?
shinjite
post Apr 21 2004, 12:04 AM

�ŞħĬΩĵΐŦ��
********
All Stars
19,176 posts

Joined: Jan 2003
From: Klang


QUOTE (TaiZi@CCF @ Apr 20 2004, 04:35 PM)
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?

Prescott's L2 cache is 128bits only
Northwood is 256bits
shinjite
post Apr 21 2004, 12:06 AM

�ŞħĬΩĵΐŦ��
********
All Stars
19,176 posts

Joined: Jan 2003
From: Klang


QUOTE (computer idiot @ Apr 20 2004, 05:10 PM)
what is command extension such as MMX, SSE, SSE2,SSE3, 3DNow Pro & AMD64?

Those are mostly feature instructions
TSikanayam
post Apr 21 2004, 12:08 AM

there are no pacts between fish and men
********
Senior Member
10,544 posts

Joined: Jan 2003
From: GMT +8:00

QUOTE (TaiZi@CCF @ Apr 20 2004, 03:35 AM)
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?

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.
charge-n-go
post Apr 21 2004, 12:29 AM

Look at all my stars!!
*******
Senior Member
4,060 posts

Joined: Jan 2003
From: Penang / PJ

QUOTE (ikanayam @ Apr 21 2004, 12:08 AM)
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.

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.
shinjite
post Apr 21 2004, 12:37 AM

�ŞħĬΩĵΐŦ��
********
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....
neuvas
post Apr 21 2004, 09:36 AM

Look at all my stars!!
*******
Senior Member
2,323 posts

Joined: Jan 2003
From: Bangi/Serdang/OP Bentley Music


u can say that again n again...

mad.gif user...
nUtZ`
post Apr 21 2004, 01:36 PM

Regular
******
Senior Member
1,868 posts

Joined: Jan 2003
QUOTE (ikanayam @ Apr 21 2004, 12:08 AM)
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.



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... wink.gif

This post has been edited by nUtZ`: Apr 21 2004, 01:36 PM
Lucifer
post Apr 22 2004, 12:11 AM

Casual
***
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
TSikanayam
post Apr 22 2004, 12:40 AM

there are no pacts between fish and men
********
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
nUtZ`
post Apr 22 2004, 02:10 AM

Regular
******
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
TSikanayam
post Apr 22 2004, 03:46 AM

there are no pacts between fish and men
********
Senior Member
10,544 posts

Joined: Jan 2003
From: GMT +8:00

Thanks for explaining nUtZ`smile.gif
shinjite
post Apr 22 2004, 03:57 AM

�ŞħĬΩĵΐŦ��
********
All Stars
19,176 posts

Joined: Jan 2003
From: Klang


Yeah thanks for the explaination NutZ thumbup.gif

6 Pages < 1 2 3 4 5 > » Top
 

Change to:
| Lo-Fi Version
0.0156sec    0.13    6 queries    GZIP Disabled
Time is now: 29th March 2024 - 04:04 AM