Intel's Pentium 4 E: Prescott Arrives with Luggage
by Anand Lal Shimpi & Derek Wilson on February 1, 2004 3:06 PM EST- Posted in
- CPUs
Prescott's Little Secret
In learning about Prescott and trying to understand just why Intel did what they did, we came to realization: not only is Prescott designed to be ramped in speed, but there was something else hiding under the surface.
When overclocking a processor, we can expect a kind of linear trend in performance. As Northwood's speed increases, its performance increases. The same is true for Prescott , but what is important to look at is increase in performance compared to increase in clock speed.
Prescott 's enhancements actually give it a steeper increase in performance per increase in clock. Not only can Prescott be clocked higher than Northwood, but as its clock speed is increased, it will start to outperform similarly clocked Northwood CPUs.
We can even see this trend apparent in our limited 3 clock speed tests. Most of the time, the 2.8GHz Northwood outperforms the 2.8GHz Prescott, but the percentage by which Prescott is outperformed decreases as clock speed increases, meaning that the performance delta is significantly less at 3.2GHz.
Business Winstone 2004
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
1.48% |
3.00GHz |
0.00% |
3.20GHz |
0.46% |
Content Creation Winstone 2004
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
-3.57% |
3.00GHz |
-5.67% |
3.20GHz |
-5.43% |
SYSMark 2004
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
1.19% |
3.00GHz |
2.27% |
3.20GHz |
2.70% |
SYSMark was one of the only applications to show a positive performance improvement for Prescott, and we see that with clock speed that advantage continues to grow over Northwood. Keep on reading, it gets even more interesting...
Aquamark - CPU Score
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
-2.87% |
3.00GHz |
-2.47% |
3.20GHz |
-0.84% |
Halo
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
-0.18% |
3.00GHz |
-0.18% |
3.20GHz |
0.00% |
GunMetal
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
-0.29% |
3.00GHz |
-0.58% |
3.20GHz |
-0.29% |
UT2003 - Flyby
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
-2.62% |
3.00GHz |
-1.46% |
3.20GHz |
-0.86% |
Clock speed goes up, Prescott performs more like Northwood.
UT2003 - Botmatch
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
-3.55% |
3.00GHz |
-3.09% |
3.20GHz |
-2.05% |
Warcraft 3
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
1.96% |
3.00GHz |
1.12% |
3.20GHz |
0.72% |
We continue to see that as clock speed increases, the gap between Prescott and Northwood decreases as well.
Quake III Arena
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
-1.33% |
3.00GHz |
-0.49% |
3.20GHz |
1.28% |
Quake becomes the textbook case of what should happen to Prescott performance as clock speed increases; although initially it is slightly slower than Northwood at 2.80GHz, by the time we reach 3.2GHz Prescott holds an advantage over a 3.2GHz Northwood. This is exactly the trend we expect to see over time, especially once we get close to 4GHz.
Jedi Knight: Jedi Academy
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
-7.63% |
3.00GHz |
-6.85% |
3.20GHz |
-7.04% |
Wolfeinstein: Enemy Territory
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
-5.53% |
3.00GHz |
-4.94% |
3.20GHz |
-3.79% |
DivX Encoding
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
-1.30% |
3.00GHz |
-0.61% |
3.20GHz |
-0.38% |
3dsmax R5
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
-9% |
3.00GHz |
|
3.20GHz |
-9% |
There will be some scenarios that do not work in Prescott's favor, and in those cases Northwood will still remain faster.
Lightwave 7.5
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
-7.7% |
3.00GHz |
|
3.20GHz |
-6.8% |
Although to a much lesser degree, we are seeing the same sort of scaling with clock speed in applications like Lightwave. It looks like our theory about Prescott's performance is correct.
Visual Studio Compile Test
| Percentage Increase in Performance from Northwood to Prescott | |
|---|---|
2.80GHz |
-8.2% |
3.00GHz |
|
3.20GHz |
-3.8% |
Much like Quake, our compile test is another perfect example of what clock scaling will do to the Northwood/Prescott gap. As the clock speed goes up, the performance delta decreases.
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INTC - Monday, February 2, 2004 - link
Ummmm yea, kinda reminds me of cooking an egg on an Athlon XP http://www.biggaybear.co.uk/Menu/Aegg/Aeggs.htmlcliffa3 - Monday, February 2, 2004 - link
something good to include on the mb compatibility article would be what boards would house the 2.8/533...i'm wondering myself if the E7205 chipset would...i have a p4g8x, and it would be a welcome upgrade with HT and all the other goodies if it oc's well.Stlr22 - Monday, February 2, 2004 - link
They didn't burn down, but the proc were running hot. Not to mention, these are the FIRST releases in the Prescott line. What's it gonna be like later on?....Just think, a P4 based computer that turns your living room into your very own Sauna!!....WHOOO-HOOO!!.....now that's what I call a bargain!
INTC - Monday, February 2, 2004 - link
The message is clear: Anandtech and all of the other review sites didn't burn down so I guess it's not a flame thrower.Prescott is not as fast as I had hoped but is definitely not the step backwards as some were rumoring it to be. I think a Prescott 2.8 @ 250 MHz FSB will be really nice to play with until I see what Intel announces at IDF in a few weeks.
Icewind - Monday, February 2, 2004 - link
The message is clear: Im buying an Athlon 64.Vanners - Sunday, February 1, 2004 - link
Did anyone catch the error in Pipelining: 101?if you halve the time for a stage in the pipeline and double the number of stages. Yes this means you can run at 2GHz instead of 1GHz but the reality is you're still taking 5ns to complete the pipe.
Look at it like a motorbike: You drop down a gear and rev harder; you make more noise but you are still doing the same speed.
The only reasons to drop down a gear are to break through your gears (i.e. slow down) or to rev significantly higher than the change in gear ratio in order to move faster (with more torque).
The trouble Intel has is that they drop down a gear then rev 6 months to a year later.
kamper - Sunday, February 1, 2004 - link
Just curious, Anand or Derek: what board did you use to get the 3.72 GHz oc? Obviously it wasn't the intel board used in the benches. I guess we'll hear all about this in the compatibility review though :)keep up the good work, that last point about smaller margins at higher clockspeeds (vs. Northwood) was cool. Let's just hope the pattern continues.
Stlr22 - Sunday, February 1, 2004 - link
Seems to me like people either got cought up in some of the hype and expected to much or some people expected to little and that history would repeat itself (Willamette vs Palomino)The fact that the Prescott fared much better in it's launch compared to the Willamette might be a hint to not underestimate it. Prescott isn't really looking bad now, and I think it will hit stride faster then the Willamette core did.
The next couple of years are gonna be really interesting.
Damn, ya just gotta love it!
ntrights - Sunday, February 1, 2004 - link
Great review!KF - Sunday, February 1, 2004 - link
I've grown to appreciate CRAMITPAL. If you read around the opinionated diatribes, he has some good stuff that people avoid saying for fear of retaliation. I suppose if I were in love with Intel, he would tick me off.But, it does look like Intel has created a CPU that should ramp up to speeds high enough to beat the A64 in 32bit mode, and that is all they needed to do.
Regardless of how much heat that is going to take, Intel must have some way in the works to handle it.
Looks like they might not charge an arm and leg for it, which is the biggest shock.