4xxx vs. 6xxx overclocking questions

[Tempered81]

Does anyone know why the e4xxx series chips (4300-4600) when paired with a nice overclocking motherboard from asus/gigabyte/dfi/abit, do not overclock over 380-400mhz FSB? I am confused because e6xxx series chips on these same exact boards will reach FSB's of 485-525mhz.

why does the one chip stop at 380 and the other goto 500?

 

[GundamF91]

There's a reason that Intel marked one processor as E4xxx and the other as E6xxx, E6xxx is suppose to be more elite of the two. standards differences in mfg and yields will determine the difference. You should be able to get 400mhz for E4500. The FSB wall doesn't come in until 425mhz or so. If I am willing to stand the additional heat and voltage, my E4500 can get 400x9, and it runs well at 400x8 but I prefer not to stress the northbridge and board since there's plenty of multiplier headroom.

 

[Tempered81]

well say you have an e4500 and an e6750. they are both capable of 3.0ghz, but only the e6750 can do it at 6x500, while the other has to do it at 10x,9x,or maybe an 8x multiplier with a sub 400 fsb. Yet you are only trying to reach 3.0ghz in this overclock.

since both chips are capable of 3.0ghz, why does the 6xxx allow 6x multi x 500mhz fsb, but the 4500 wont? Is it just that the 4000 series chips cant handle high fsb's? Oh, well, i suppose it isn't entirely important as the 4xxx chips come with higher multipliers anyway. I am just wondering if we are going to experience similar issues with e8200's not going as high on the fsb as e8500's

 

[XBoxLPU]

Originally posted by: jaredpace
well say you have an e4500 and an e6750. they are both capable of 3.0ghz, but only the e6750 can do it at 6x500, while the other has to do it at 10x,9x,or maybe an 8x multiplier with a sub 400 fsb. Yet you are only trying to reach 3.0ghz in this overclock.

since both chips are capable of 3.0ghz, why does the 6xxx allow 6x multi x 500mhz fsb, but the 4500 wont? Is it just that the 4000 series chips cant handle high fsb's? Oh, well, i suppose it isn't entirely important as the 4xxx chips come with higher multipliers anyway. I am just wondering if we are going to experience similar issues with e8200's not going as high on the fsb as e8500's

Though running the same clock speed with different FSB (higher) doesn't show much performance gain if any and just higher heat producded.

 

[Tempered81]

True, but i still don't understand why a 4000 series cannot handle a 6x500 FSB in the exact same motherboard that a 6000 series chip has no problem handling.

 

[lopri]

There could be many reasons. When Intel used to make the E6300/E6400, they used to clock just as high as their bigger brothers in terms of FSB. With improved yields and advance in manufacturing, E4xxx series are produced in different production line. Since it's posed as a mid-value part, there can be many things that Intel might be doing.

- Use different material (substrate) and different fabs. Intel has many fabs.
- Intentionally or unintentionally the chip programming cripples FSB overclocking. Remember that Intel works with mobo manufacturer's and it's possible they didn't bother to tell how to make boards for E4xxx series overclock.
- On the same line, remember the E4xxx series' base FSB is 800. It's possible the internals of them are quite different from those of 1066/1333 FSB CPUs (i.e. optimized for lower strap setting -> lower FSB overclock).

Just a few off my head.