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having fun with Prescott
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Old 9th June 2004, 07:28   #51
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ordered my prescot 2.4 533 yesterday
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Old 9th June 2004, 17:54   #52
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Quote:
Originally posted by Liquid3D
RichBastard I would highly recommend getting the Prescott, when you get up past the 3.6GHz the benefit of the 1MB cache becomes evident......

what prescott would you advise, the A's or the E's ?
 
Old 9th June 2004, 18:07   #53
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If I put it in the IS7 board, it has had topped 3.3 Ghz stable; with cheap air cooling.
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Old 11th June 2004, 23:00   #54
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Quote:
Originally posted by kristos
what prescott would you advise, the A's or the E's ?
I would suggest the E's. I think the overclockability is much greater. There still needs to be a fix found for the feature known as Dynamic-VID which has the CPU Vcore fluctuaute based on temp, and Intel's On-Demand feature. Information on VRD Thermal can be found here (Section 2.4 on), and information concerning On Demand Mode can be found here (Section 3.4.5).

The 90nm 2.4A's for $124 (and free Intel Bunny) are highly overclockable. Usually reaching 3.4GHz on water. The 533FSB is a moot point when overclocking anyway, so don't let that deter you. My 3.0E does 4.0GHz, and the only thing holding it back, is the failure of Motherboard makers, to beef up the PWM (mobo CPU power circuitry). In other words Prescott got a very bad rap, and it has nothing to do with the processor design, but in fact anemic mobo power circuits. Motherboard makers felt upgrading power-circuitry on Socket-478 mobo's wouldn't be profitable due to the small number of Socket-478 Prescott's sold, and their concentrating on the upcoming Grantsdale LGA-775 Prescott ready platform. Too bad all Socket-478 Prescott owners are penalized for the greed of a few manufacturers. I'd certainly pay $20 even $30 more for a Canterwood based 478 board with an adequate power supply (and mosfett heat-pipe cooling like that found on Chaintech's RADX). My PWM temps on the AI7 reached 87C when running my 3.0E at 3.8GHz under LOAD.

Once the 90nm E's reach the 3.5GHz mark the 1MB cache begins to make a large diff in performance.
 
Old 12th June 2004, 01:57   #55
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So basically, if the mobo manufacturers beef up the power circuitry on their LGA-775 mobo's (and get those issues with the socket fixed), it would be a good buy.

Do you think cooling the back of the board with some fans would do some good? Or would the effect be negligable to non-existent?
 
Old 21st August 2004, 21:23   #56
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http://quarantaine.mongtastic.be/cpu.JPG

non stressed, dividers(5:4, fixed pci) and the utmost crap cooling(coolermaster standard p4cooler not even intended for prescott)
this is with one 256Mb takems(what in a name) pc3200 because the mushkin apparently doesnt work with the ic7max3.

going to install watercooling next week to test it on extreem stability
 
Old 22nd August 2004, 03:29   #57
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Sorry, I think my post above was misintepreted. There's absolutely no motherboard power circuitry issues with recent 90nm LGA Prescott on the Socket-T 915/925 boards. The original issue existed between the Socket-478 motherboard, which was designed for a completely different processor architecture, and was therefore unable to meet Socket-478 Prescott power requirements. In fact the Socket-478 Prescott is at best a misnomer, and at least a contradiction. While Socket-478 Prescott was based on lower voltages, it required higher current (e.g higher wattage), and presented an entirely different load to naive Socket-478 power circuitry. This is why in some early Socket-478/ Prescott overclock's, motherboards actually melted from power circuitry temps as high as 93.3C/200F.

It was these issues which originally prompted MSI to lock-out BIOS Vcore adjusts on their "Prescot ready" Socket-478 motherboards. Here's MSI's words in a discussion with [H], about this decision;
Quote:
The 865PE Neo2-P Platinum Edition is designed to support the Intel(r) next generation Pentium 4(r) processor: Prescott. However, owing to the different manufacturing process and power management, we've made some voltage limits in the BIOS to protect the Prescott P4 CPU from burning out. Meanwhile, you'll also find that there is no CPU voltage settings to adjust. This is also for system protection.
While the first half of this statement seems to simultaneosly place blame, under the guise of protecting 478-Prescott for their "voltage limits" it's the latter part of the paragraph which is telling, "This is also for system (read: motherboard power circuits) protection." In another statement between [H] and MSI found in this article, they delve into the D-VID issue discussed in my article here at [M].
Quote:
I discussed the Vcore change question with the board designer over last weekend. Base on my understanding, the reason we didn't offer that when Prescott is populated was because a new Intel VID design on Prescott: "Dynamic VID" (VID becomes variable on different stages). According to the board designer, if M/B (BIOS) overwrite the Vcore, Dynamic VID will become invalid which might damage the CPU (Prescott Core) when power stage changed.
.

Now, if you've recently purchased an LGA Prescott and Socket-T motherboard and are having overclocking problems, the issue is not related to the motherboard's power circuitry. At least not in-so-far as a design oversight. What Intel has done to prevent overclocking beyond a certain percentage, is to limit voltage to the 915/925 North Bridge. In just about all the LGA Socket-T overclocking scenario's you'll find almost everyone is limited to about the same 227FSB (1:1) maximum. Any excessive heat generated is merely the end-result of frustrated Overclocker's pushing too much Vcore into their CPU's.in the false belief thisis the obsacle tey must overcoe. Nothing could be further from the truth. This is because the same D-VID power circuitry found ion the 90nm Socket-478 Prescott is found in it's younger sister 90nm LGA Prescott. Ergo, when pushing excessive Vcore into these processors they become overheated. First; as the prima facie result of added current. Second; as D-VID begins to malfunction.

The trick to acheiving a decent overcock on all LGA Socket-T Prescott platforms, is increasing the voltage to the North Bridge, and actually leaving the Vcore at Deafult or Auto. No other Vcore setting will suffice, because only on the Default or Auto settings in the BIOS is the D-VID feature allowed to operate the way it was intended. Even Manual adjustment to the Vcore where it's set to the minumum required Vcore will essentially Lock-out the D-VID feature, causing power ciruitry conflicts. I found this to be true time and time again, even with my Socket-478 Prescott, and Asus P4C800E-Deluxe, or Abit AI7 combo's. My 478-Prescott 3.0E easily attains 250FSB (1:1)(15x250FSB=3750MHz) on Auto but will struggle at higher Vcore at same speeds. At one time this wouldn't occur in any other scenario, however; even AMD now implements "Cool n Quiet" technology, utilizing such power saving/thermal throttling features. You'll also notice Intel has prevented most (perhaps all) OEM mobo manufacturers from allowing chipset voltage adjustments in their 915/925-chipset BIOS. This is because down the line when DDR-2 attains another speed increase, they'll want to introduce another chipset version such as the 915X or 925X-Pro for example.
 
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