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View Full Version : P4 775 compared to P4 748 & Hard drives



Cyberman
17-09-2004, 02:54 PM
Do you know anything about the new 775 socket intel P4 CPUs and whether
they are much better than the
older P4 socket 478 CPUs?

I am seeing ads for alleged 775 P4 systems with "520/530/540" model
hyperthreading P4 CPUs etc, but the price is too low for the model numbers
to be true - they must be the old socket 478 P4s and either the sellers
can't tell the difference (see http://www.intel.com) or they are just
lying. Also, just on the off chance, do you know whether running a slower
hard drive alongside a faster hard drive will mean the faster one is
limited to the top speed of the slower one?? Wondering if I can team a new
10000rpm Western Digital raptor model (74 gigabytes) with a bigger (250gb)
but slower (7200 rpm) model.

Pete O\'Neil
17-09-2004, 03:18 PM
> Do you know anything about the new 775 socket intel
> P4 CPUs and whether
> they are much better than the
> older P4 socket 478 CPUs?
>
> I am seeing ads for alleged 775 P4 systems with
> "520/530/540" model
> hyperthreading P4 CPUs etc, but the price is too low
> for the model numbers
> to be true - they must be the old socket 478 P4s and
> either the sellers
> can't tell the difference (see http://www.intel.com)
> or they are just
> lying. Also, just on the off chance, do you know
> whether running a slower
> hard drive alongside a faster hard drive will mean
> the faster one is
> limited to the top speed of the slower one??
> Wondering if I can team a new
> 10000rpm Western Digital raptor model (74 gigabytes)
> with a bigger (250gb)
> but slower (7200 rpm) model.

The shift from socket 478 to 775 doesnt provide any preformance boost, the only benefit comes from the uses of Intel's new 9XX series of chipsets that are normally used with the new socket. These new chipsets are designed to be used with the newish Prescott core and thus make the Prescott preform on par with a Northwood. Socket 775 is better from a futureproofing stand point as new CPU will continue to be released for it for a long time to come. Where as with socket 478 no more CPU will be released.

Im going to assume that both those harddrives are SATA, but even if the bigger drive was PATA it wouldnt make a difference. The raptor is definatly SATA and thus has its own channel, this means it wont effect the preformance of any other drives. The only way in which a harddrive can affect the preformance of another is if they are both PATA and are on the same channel. If one harddrive has a slower interface e.g ATA100 and ATA133, then the drive with the faster interface will be forced to run at the slower speed. A drives RPM cannnot be affected by another drive.

PaulD
17-09-2004, 03:43 PM
IDE controllers since PII days have had independant device timing. So long as each drive is using DMA mode, they operate at their own speed.

Lohsing
17-09-2004, 03:47 PM
> effect the preformance of any other drives. The only
> way in which a harddrive can affect the preformance
> of another is if they are both PATA and are on the
> same channel.

I think the main difference is the use of "Matrix Raid" under the new chipset.

Looks like a very cool feature.

Lo.