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1300MHz & 1400MHz : what is the difference

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downhiller80

Platinum Member
What differences are there between these 2 athlon chips. Both 200fsb. How can I make my chip THINK it's a 1400? Is it to do with L3 & L4 on top of the chip? Or is this info laser etched onto the core or something?

- seb
 
the difference is 100mhz 🙂

the performance difference will be marginal at best somewhere in the neighborhood of 2-3%.

You can do one of the things:
Raise your FSB or unlock the L1 Bridges.

There is plenty of info on the web about both of them. Your current cooling should be sufficient since you will only be bumping it up a 100mhz....
 
Let me rephrase:

in order to use the 14x multiplier on my motherboard (A7V) the board HAS to think it's a GENUINE 1.4GHz chip. So what on the chip (it's unlocked) tells the board what speed it's rated for?

- seb
 
If your Athlon B is unlocked, that means the L1 bridges are closed, right? As long as they are closed, you're free to manipulate the multiplier thru the bios.

Go into the bios, go to the area with the CPU/FSB info. Under "speed" or "multiplier", change it from Auto to User Select (or words to that effect). Then you can change the multiplier from 13 to 14 or whatever.

Be aware that not all CPU's will overclock with the multiplier without raising the core voltage. In fact, my old 1GHz Athlon B wouldn't do more than half a step (10 to 10.5x) even with the voltage maxed-out. Good luck.
 
Michael D: Wrong.

My multiplier can be adjusted from 5 to 12.5 manually.

IF and ONLY IF I run a 1.3GHz chip will 12.5 be mapped to 13.

Likewise IF and ONLY IF I run a 1.4GHz chip will 5 be mapped to 14.

- seb
 


<< My multiplier can be adjusted from 5 to 12.5 manually. >>



Seb, true that YOUR board can go from 5 to 12.5 manually, and the multiplyer on chips now set the board to the multiplyer, but there are some new boards that will go above 12.5, like my board can go to 15, but it's locked out at a certain multiplyer for certain chips. Ie. you can't go higher than the cpu multiplyer without unlocking the chip.

If your board can't go above 12.5, then you will have to manipulate the fsb to get the overclock, whereas I could overclock the fsb and the chip multiplyer and get an overclock a bit from each. Your chip must let the mobo do 13 x 100 to give you your 1300Mhz, so I would say, try 13 x 120 or 13 x 133 or whatever increments you can do(just go in the smallest amounts first to up your fsb). You might even want to drop your mult to 12 or 12.5 and go with a higher fsb too. Try combos and that should help you out.
 
It's an A7V. So I'd be lucky to get 110 FSB. I'm not keen on overclocking FSB anyway, unless I can drop the PCI ratio to keep it near 33MHz.

But if 14 x 100 is acheivable on this board with a 1.4GHz chip then it must be possible to "get" this multiplier using my 1.3GHz chip, SOMEHOW.

- seb
 


<< It's an A7V. So I'd be lucky to get 110 FSB. I'm not keen on overclocking FSB anyway, unless I can drop the PCI ratio to keep it near 33MHz.

But if 14 x 100 is acheivable on this board with a 1.4GHz chip then it must be possible to "get" this multiplier using my 1.3GHz chip, SOMEHOW.

- seb >>



100 MHz from a multiplier adjustment won't make a very negligible difference.
Raising the FSB, however, will, as it basically overclocks everything (as you probably know). If you have a selection for spread spectrum, or PCI bus divider, OC the FSB, and use that divider to keep your PCI bus at 33 MHz. Try the FSB OC, and see where you get.

...maybe a BIOS flash can help you out?
 
If the 1.4Ghz chip will give 14 x 100, then that "14" multiplyer comes from THAT cpu, not anywhere else since you can only manually put the mobo to 12.5, just like the 13 x 100 you have now comes from THAT cpu (cpu gives 13x multiplyer). You can't get a 14x multiplyer out of a 1.3Ghz cpu on a board that maxes out at 12.5x.
 
But this is what I'm getting at. Since all chips are created equal initially and then categorised and sold as different parts, what is done to the CPU at the end of this process to make it "know" it's a xxx MHz chip?

- seb
 
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