Difference between E6550 and E6750, multiplier only?

I was reading the comparison matrix in Wikipedia and had spot that the
only difference between the two CPUs resides in the multiplier (from 7x
to 8x), the rest looks identical.

Is it a joke? Let's say I buy a Gigabyte P35-DS3 running a E6550 and I
set the multiplier to 8x shall it be the same as running a E6750??

The price difference between the two is marginal, is it worth overclocking?


Thanks
Fabio

Fabio Corazza wrote:
> I was reading the comparison matrix in Wikipedia and had spot that the
> only difference between the two CPUs resides in the multiplier (from 7x
> to 8x), the rest looks identical.
>
> Is it a joke? Let's say I buy a Gigabyte P35-DS3 running a E6550 and I
> set the multiplier to 8x shall it be the same as running a E6750??
>
> The price difference between the two is marginal, is it worth overclocking?

Ehm small underestimation on my side, looks like the multiplier is
locked towards higher values on those CPUs. Is there a way to unlock it
or the OC has to be made through other parameters?



Thanks
Fabio

'Fabio Corazza' wrote:
| Ehm small underestimation on my side, looks like the multiplier is
| locked towards higher values on those CPUs. Is there a way to unlock it
| or the OC has to be made through other parameters?
_____

Unless you have an Intel 'Extreme Edition' CPU, the CPU clock multiplier can
not be set higher than stock. This has been true since about the Pentium II
300 MHz (except for early Pentium Classics.) The multiplier limit is set
during manufacturing by a physical change on the CPU die.

The standard way of overclocking a modern Intel CPU is to increase the FSB
frequency. You may need to reduce the memory clock since your FSB speed is
1333 MHz. Your motherboard should have settings to set the memory clock to
a fraction of the CPU clock or to set it independently. Some have found
that reducing the CPU multiplier while increasing the FSB frequency can help
overclock. However, usually good results can be obtained by keeping the CPU
multiplier at stock and just increasing the FSB frequency (adjusting the
memory clock to keep the memory speed within the capabilities of your memory
modules. Usually you can overclock to some extent with no change in the CPU
core voltage (I have an Intel E4300 that overclocks by 50% from 1.8 GHz to
2.7 GHz with a LOWER than stock specification CPU voltage). Higher
overclocks may require raising the CPU core voltage by 10% or more. Lower
CPU temperatures also help. Intel CPUs can NOT be destroyed by overheating.
Intel CPUs CAN be destroyed immediately if you raise the CPU core voltage
too much; be very careful when raising the CPU core voltage more than 10%
above stock specifications.

An E6550 CPU overclocked to the same speed as an E6750 CPU would have the
same CPU performance as the E6750. The increased FSB speed will also
increase performance for transfers too and from memory.

Phil Weldon

"Fabio Corazza" <fabio@non-existent.int> wrote in message
news:fllujj$eoh$2@tdi.cu.mi.it...
| Fabio Corazza wrote:
| > I was reading the comparison matrix in Wikipedia and had spot that the
| > only difference between the two CPUs resides in the multiplier (from 7x
| > to 8x), the rest looks identical.
| >
| > Is it a joke? Let's say I buy a Gigabyte P35-DS3 running a E6550 and I
| > set the multiplier to 8x shall it be the same as running a E6750??
| >
| > The price difference between the two is marginal, is it worth
overclocking?
|
| Ehm small underestimation on my side, looks like the multiplier is
| locked towards higher values on those CPUs. Is there a way to unlock it
| or the OC has to be made through other parameters?
|
|
|
| Thanks
| Fabio

Somewhere on teh intarweb "Phil Weldon" typed:
> 'Fabio Corazza' wrote:
>> Ehm small underestimation on my side, looks like the multiplier is
>> locked towards higher values on those CPUs. Is there a way to unlock
>> it or the OC has to be made through other parameters?
> _____
>
> Unless you have an Intel 'Extreme Edition' CPU, the CPU clock
> multiplier can not be set higher than stock. This has been true
> since about the Pentium II 300 MHz (except for early Pentium
> Classics.) The multiplier limit is set during manufacturing by a
> physical change on the CPU die.
>
> The standard way of overclocking a modern Intel CPU is to increase
> the FSB frequency.

Just thought I'd mention, I hear a whisper that the 45nm Intel CPUs are
going to be multiplier-unlocked.

Actually, I read between the lines on this page:

<http://64.233.179.104/translate_c?hl=en&langpair=zh%7Cen&u=http://www.hkepc.com/%3Fid%3D171%26page%3D1>

And seeing the words "Overspeed Protection Removed" and some fine-print in
the fourth picture down the page.
--
Shaun.