Does EM64T add any speed with a 32-bit OS?

Custom / Computer
November 11, 2010 at 14:26:01
Specs: Windows XP Pro SP3, Pentium 4 HT, 3.00 GHz-x64-1 Gb. DDR-400
Hello,

I was wondering if EM64T adds any significant speed when using a 32-bit OS. I had a 3 GHz 64-bit Pentium 4 HT in my system before it eventually started having FSB problems. I have a 3.2 GHz Pentium 4 that I am going to install into my system.

I know that a 32-bit CPU can only address about 3.5 gigs of ram and a 64-bit suppports 16 Exabytes of ram, but a 64 makes no difference because my motherboard only supports 2 Gbs max.

Thanks

Pentium 4s - The processors for the rest of us.


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#1
November 11, 2010 at 15:26:48
No.

"I had a 3 GHz 64-bit Pentium 4 HT in my system before it eventually started having FSB problems"

Don't blame the CPU, it's running at the wrong speed because you have the BIOS configured incorrectly. Maybe it's time to give up on the P4? It's not a good CPU. Maybe this comparison vs the lowly Atom CPU will put it in perspective:

"In the end, there’s a simple conclusion for everyone who wants a low cost system: keep your old Pentium 4 system if you have to, but bear in mind that all relevant metrics (performance, noise, power, and efficiency) are pathetic by modern standards."

Intel Pentium 4 Vs. Atom


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#2
November 11, 2010 at 15:32:56
I had cleared the CMOS, re-flashed the BIOS and finally I tried a different CPU. The FSB was running at 533 MHz on the previous one which was limiting the speed to 2 GHz.

I put a 3.2 GHz Pentium 4 in and it runs at the full 800 MHz FSB.

Pentium 4s - The processors for the rest of us.


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#3
November 11, 2010 at 16:03:13
Clearing CMOS isn't necessarily a good thing. Defaults are only a tool to get things up & running. BIOS settings should be manually configured whenever possible. The performance difference between BIOS defaults & a properly tuned BIOS can be as much as 20-25%.

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#4
November 11, 2010 at 18:36:24
"I was wondering if EM64T adds any significant speed when using a 32-bit OS."

Nope. The feature isn't even used by 32-bit OSs.

Windows x64 isn't much faster than Win x86. A few years ago I tried both versions of the Vista Beta on my 3.2GHz Opteron X2 machine. Vista 64 was like 3% faster in CPU benchmarks than Vista 32.

Although, I now run 64-bit Photoshop CS5 on Win7 and it does seem quite a bit faster than the 32-bit CS3 I was using a year ago (same machine, same OS). I'm not sure if the speed comes from the program's 64-bitness or something else. :)

Super PIII | Unlocked ES Tualatin @ 1.8GHz (150x12, 1.65v, 512K L2),
2GB PC2700 | 500GB | Radeon x1950Pro | Apollo Pro 266T | Win7 Pro


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#5
November 11, 2010 at 19:12:44
The 3.2 GHz is noticeably faster and now I know that the EM64T was completely useless.

Also, with the 3.0 GHz I wasn't able to do any overclocking or underclocking because every time you made an attempt it would reboot to a black screen. The 3.2 GHz P4 is now running stably at 3.52 GHz.

Pentium 4s - The processors for the rest of us.


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