CPU Problem

Simon_89 · 8 Jun 2012 at 21:11

Hey guys,

Bought a new processor for my old pc, was a simple upgrade from a Pentium 4 1.7Ghz to a Pentium 2.8Ghz.

First of all my motherboard started up fine and it said that hyper threading was active. The only problem is on CPUID it's showing the clock speed as 1.6Ghz?

I'm a bit puzzled and to be honest don't have the knowledge to know we're to troubleshoot.

Any ideas guys?

Thanks

Orcvader · 8 Jun 2012 at 21:14

If you put it under load, does it clock back up to 2.8ghz? Could be Intel's Speed Step kicking in to clock it down when it's idle to save power/lower temps, but I'm not sure if Speed Step was implemented in the Pentium 4s.

flame696 · 8 Jun 2012 at 21:14

you need to go into your bios and disable intel speed step. Intel speed step is a power saving feature it basically clocks the speed down of the CPU when it isnt in use

Simon_89 · 8 Jun 2012 at 21:21

Ok I will have a look in the bios for speed step. Was a little worried that it was going to be massively underclocked!

Thanks guys!

jamesfreddie · 8 Jun 2012 at 21:24

I think you will find speedstep didn't exist in the 478 days.

What motherboard do you have?

What FSB is the new CPU.

The most likley problem is that your motherboard dosen't support that high a FSB.

Justintime · 8 Jun 2012 at 21:26

Your bus speed is set to 100Mhz mate. Whats the FSB of your new cpu and whats the board you're using it on? Seems the cpu speedstep is not being used and its locked down to the lowest multiplier x 100MHz = 1600MHz. Your board may not support this cpu, especially if its a 200MHz (800FSB) chip, going by the age of the first chip it had.

Justintime · 8 Jun 2012 at 21:29

jamesfreddie said:
I think you will find speedstep didn't exist in the 478 days. The most likley problem is that your motherboard dosen't support that high a FSB.

Think you'll find that it did mate. Doing the math, 16x133 = 2.13GHz and 16x200 = 3.2GHz, neither combination gives 2.8Ghz so the cpu must be able to clock down its multiplier somehow.

Simon_89 · 8 Jun 2012 at 21:43

It's a QDI Platinix 2e. From what I've read on the net the Northwood CPU is supported and that this speedstep was implemented in Pentium 3 processors too?

Justintime · 8 Jun 2012 at 21:51

Is this a 200fsb cpu? Looks like a 845PE chipset board that supports only 533 (133) cpus if my memory is right. Also what RAM are you using? Just a guess but you might need 133 (PC2100) at least to get a 533FSB, if you've got PC1600 it might be an issue.

Simon_89 · 8 Jun 2012 at 21:58

I don't have a clue to be honest with you, bought the CPU of eBay for £2. It has 1GB of DDR ram

Justintime · 8 Jun 2012 at 22:00

What was the cpu description? It should say on the page at least.

MagicBoy · 8 Jun 2012 at 22:01

What are the specs on the CPU? The 2.8 came in 400(rare)/533 and 800 FSB varieties.

Edit : Link to the eBay auction?

jamesfreddie · 8 Jun 2012 at 22:01

Justintime said:
Think you'll find that it did mate. Doing the math, 16x133 = 2.13GHz and 16x200 = 3.2GHz, neither combination gives 2.8Ghz so the cpu must be able to clock down its multiplier somehow.

I think you will find i am right.

Find me a 478 CPU that shows it has speedstep.

If the CPU is 2.8GHz and has 800FSB then it has a 14 multi.

So 14 x 200MHz = 2.8GHz.

Justintime · 8 Jun 2012 at 22:05

jamesfreddie said:
I think you will find i am right.

Find me a 478 CPU that shows it has speedstep.

If the CPU is 2.8GHz and has 800FSB then it has a 14 multi.

So 14 x 200MHz = 2.8GHz.

My point exactly. Its running at 16x so it can't be a 200fsb cpu, if it was a 533FSB or 400fsb cpu then 16x would be under the default multiplier. I can show you a bunch of Pentium 4 Northwood 478 mobiles with speedstep.

MagicBoy · 8 Jun 2012 at 22:05

Speedstep was only implemented on mobile P3 and P4 CPUs. First outing on the desktop chips was the Pentium-D as it ran hotter than a furnace!

jamesfreddie · 8 Jun 2012 at 22:09

Justintime said:
My point exactly. Its running at 16x so it can't be a 200fsb cpu, if it was a 533FSB or 400fsb cpu then 16x would be under the default multiplier. I can show you a bunch of Pentium 4 Northwood 478 mobiles with speedstep.

We are not talking about mobile CPU's.

MagicBoy said:
Speedstep was only implemented on mobile P3 and P4 CPUs. First outing on the desktop chips was the Pentium-D as it ran hotter than a furnace!

^
My Point

Justintime · 8 Jun 2012 at 22:10

MagicBoy said:
Speedstep was only implemented on mobile P3 and P4 CPUs. First outing on the desktop chips was the Pentium-D as it ran hotter than a furnace!

While i agree in theory, there were Desktop variants of the Northwood used in many laptops that i serviced that had speedstep (very rudimentry and literally only 2 stages) that had a 1.525V (i.e desktop) core voltage, not the usual IHS-less Pentium 4 mobile, so it is quite possible to get one of these chips sold as a normal P4.

MagicBoy · 8 Jun 2012 at 22:12

Erm. Justintime wins on points. Mobile P4's were still technically socket 478.

The less said about laptops with P4 desktop chips in them the better! The mobile chips were all only low/high frequency switchable until the P-M arrived.

Anyway, this is going off topic...

Justintime · 8 Jun 2012 at 22:13

MagicBoy said:
Erm. Justintime wins on points. Mobile P4's were still technically socket 478.

Anyway, this is going off topic...

lol.. true. We need to find out what the darn cpu is

jamesfreddie · 8 Jun 2012 at 22:16

MagicBoy said:
Erm. Justintime wins on points. Mobile P4's were still technically socket 478.

The less said about laptops with P4 desktop chips in them the better! The mobile chips were all only low/high frequency switchable until the P-M arrived.

Anyway, this is going off topic...

Justintime said:
lol.. true. We need to find out what the darn cpu is

You win the discussion