Big difference in speed between P4 630 chip and P D 820?

I was wondering if there was any big speed difference between these two chips or what the difference is?

Pentium® 4 Processor 630 with HT Technology (3GHz, 800FSB)
Pentium® D Processor 820 with Dual Core Technology (2.80GHz, 800FSB)


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Intel® Pentium® D Processor 820
Processor Number :820
Architecture :90 nanometer technology
L2 Cache :2x1M
L3 Cache :N/A
Clock Speed :2.80 GHz
Front Side Bus Speed :800 MHz
Other Intel Technologies :Execute Disable Bit,Intel® EM64TØ,dual-core
Package :FC-LGA
Chipset :Intel® 955X Express Chipset,Intel® 945G Express Chipset,Intel® 945P Express Chipset
Memory Type :Dual Channel DDR2 400/533/667

Boards:Intel® Desktop Board D945PSN,Intel® Desktop Board D945PLM,Intel® Desktop Board D945PVS,Intel® Desktop Board D945PAW,Intel® Desktop Board D945GNT,Intel® Desktop Board D945GTP,Intel® Desktop Board D945GCZ

Slot/Socket Type :LGA775
Min-Max Voltage :1.20-1.40
Pin Count :775-land
sSpec Number :SL88T
Pentium® 4 Processor 630 supporting Hyper-Threading Technology†    
Processor Number :630
Architecture :90 nanometer technology
L2 Cache :2M
L3 Cache :N/A
Clock Speed :3 GHz
Front Side Bus Speed :800 MHz
Other Intel Technologies :HT† Enabled,Execute Disable Bit,Intel® EM64TØ,EIST
Package :FC-LGA

Chipset :Intel® 925X Chipset ,Intel® 915P Express Chipset,Intel® 915PL Express Chipset,
Intel® 915G Express Chipset,Intel® 915GL Express Chipset,Intel® 915GV Express Chipset

Memory Type :NA
Slot/Socket Type :LGA775
Min-Max Voltage :1.25-1.40
Pin Count :775-land
sSpec Number :SL7Z9    

Good Luck
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Good luck
While Pentium 4 830 is a single core processor, Pentium D is actually composed by two complete processor within the same physical package.

You question is really a very good question, because two processors does not means double performances. It's quite easy to summarize when and why a dual-core processor is better than a single core processor:

If you plan to do massive audio and video processing, go with the Pentium D (dual-core), because audio and video processing applications are usually optimized for multi-processor systems.

If you plan to run multiple (several) applications at the same time (must be cpu-intensive apps), go with the Pentium D (dual-core).

If you plan to run a server with several services (web server, database, ...) with heavy load, go for Pentium D (dual-core).

If you plan to use the processor for standard and single applications (game, internet browsing, word processing, imaging), standard Pentium 4 (single core) is the best both for performance and cost.

If you plan to use the processor for multiple "non cpu-intensive" applications (word processing and internet browsing at the same time, or internet browsing and download), standard Pentium 4 (single core) is the best both for performance and cost.

In general, dual-core processor potential performance is used only if there are multiple cpu-intensive applications or single applications with optimized multi-threaded processing. In all other cases, Pentium D is used just like a single-processor CPU, with several additional drawbacks (lower frequency, no Hyper-threading capability, shared memory bus, more power consumption).

Here you can find some benchmarks:

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What lombardp said.

The 2 processors you're asking about are actually rather close in clockspeed (2.8GHz for the dual core vs. 3.0GHz for the single core), so the Pentium D 820 will perform nearly the same in single threaded applications as the Pentium 4 630. The Pentium D is pretty much 2 Pentium 4's packaged in one, running at 2.8GHz rather than 3.0GHz in your example.

If cost were equal between the 2, I'd strongly suggest going with the Pentium D for almost anyone. It would be my personal choice between the 2, hands down, if it's in the budget. The big tradeoff here will be that the Pentium D is not only more expensive, it will also require a motherboard that is likely to be more expensive than one you'd get for the Pentium 4, and possibly a larger power supply and better cooling as well, so overall you'll be spending more. Additionally, it appears that XP Home might not make use of more than 1 processor core, which means additional money for XP Professional (does anyone have definitive info on this?) - if you were going to run XP in the first place, that is.

But in situations where multiple programs, or multiple threads within the same program (such "multi-threaded" programs are still a rarity, but this will eventually change), want to make use of the processor, the speed benefit can be very dramatic in favor of dual core. Almost everyone also reports that the computer simply feels so much more responsive with dual core even when under load, something which is hard to measure with benchmarks (in other words, when you open the Start menu, it comes up right away even when the computer is busy, etc.). These dual core processors are relatively new, but they are going to be the wave of the future, and in time (years?), software will take more and more advantage of it.

But lombardp is very right that the choice does depend on what you plan to use the computer for. That, and the budget.

Good luck.

TheRookie32Author Commented:
Is the new windows OS going to utilize dual core technology?
As Anton74 said, Windows XP Professional already supports dual processor systems (also Windwos 2000 Pro).

The problem is that, applications capable of take advantage of multi-processors system are still a rarity (they are mainly audio/video processing apps). A standard single-threaded applications would take no advantage from a dual core processor, unless you execute multiple single threaded appliactions at the same time.


If you are asking about the successor to XP, Longhorn, then yes, dual core support certainly ought to be there. Windows 2003 Server supports dual core and beyond.

Also, it turns out that while XP Home will support only 1 physical processor, it does support 2 logical processors (as is the case with a HyperThreaded P4). Apparently a dual core processor could then be supported as 2 logical processors, which is not as good as native support for the 2 physical cores, but it's definately something (then again, the Pentium 4 630 is HyperThreaded, so it would already function as 2 logical processors, which offers some limited multi-tasking benefit in certain situations, not at all the same as 2 actual processors). I'm still trying to find out exactly how this works with XP Home; surprisingly I could not find out definitive information even on Microsoft's web site. See the lengthy information in the last post on this page:

TheRookie32Author Commented:
Just for grins, does Photoshop CS2 have support for dual processor systems (run faster with the Pentium D).  I dont think in the end it would be a big diff with PS but with Adobe's video editing software, it prob would be...

Im really just planning on using this pc for your standard office programs and also photo editing and maybe light video editing (editing home movies etc but not any #d rendering).  Thinking the 630 would be fine.
There is some benefit, but it seems to rather limited for Photoshop, probably not at all enough to warrant the additional investment. Have a look at this benchmark, which shows performance of the Pentium Extreme Edition 840, which is a good bit faster (and *much* more expensive) than the Pentium D 820, as well as a number of single core processors:

Here's another benchmark, looking at Photoshop 7.0.1 (older than CS2) and Premiere 6.5:

Premiere also doesn't benefit much at all from dual core, which I find a bit surprising.

So considering this, you're probably right to go with the 630.

Thanks for the points, and best of luck.

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