AMD cpu formula

[AthlonAlien]

Zebo (or anyone)

I have noticed Zebo's formula for calculating AMD's cpu performance...

(formula)
1500 x CPU Speed x 1.05 (if Dual Channel) x 1.05 (if 1MB Cache) = PR Rating (round)

(example) Athlon 64 3500+ @ 2.610 (290 x 9)
1500 x 2.200 x 1.05 = 4110.75 (4100+)

Here's my question... I have seen several benchmarks showing the example CPU edging out a FX-55 (4200+). I know the difference must be because of the FSB/HTT speed (and the RAM bandwidth that goes with it at 1:1). I was wondering if there was a way or a new modified formula (ver 2.0 ) to factor in the FSB/HTT speed? I am just curious...

-Thanks

 

[yliu]

It wouldn't make sense to factor in FSB/HTT/RAM speed in the formula because the formula is supposed to rate only the CPU... If you factor those other things in you are almost rating the performance of the whole system.

 

[Gamingphreek]

Umm yeah it would.

As for the formula there are multiple depending on the chip and the chip you are comparing it to. Which would you like. THis of course is made by Zebo and i take no credit for it.

-Kevin

 

[Rich85]

Originally posted by: AthlonAlien
Zebo (or anyone)

I have noticed Zebo's formula for calculating AMD's cpu performance...

(formula)
1500 x CPU Speed x 1.05 (if Dual Channel) x 1.05 (if 1MB Cache) = PR Rating (round)

(example) Athlon 64 3500+ @ 2.610 (290 x 9)
1500 x 2.200 x 1.05 = 4110.75 (4100+)

Here's my question... I have seen several benchmarks showing the example CPU edging out a FX-55 (4200+). I know the difference must be because of the FSB/HTT speed (and the RAM bandwidth that goes with it at 1:1). I was wondering if there was a way or a new modified formula (ver 2.0 ) to factor in the FSB/HTT speed? I am just curious...

-Thanks

lol... this just has to do with its PR RATING nothing to do with what the actual IPC's are.

so it does not matter if it is faster then an fx55 or what ever, the formula is just meant to calculate what the theoretical equivalent PR RATING is.

OCing the HTT is just a means of cheating AMD out of there lower locked multis (therefore cheaper for the consumer for overall sys performance) and also to out perform the highest retail spec of any given core... i.e. a 2.6 OCed winnie on stock cooler (AMD dont even have a retail 2.6 winnie) they only have a 2.2 winnie and that is the 3500+ !!!

and anyway AMD only brand there chips accordingly to combat Intel in the marketing of the frequency race.

EDIT: mis type 3500+ winchester as 2.4 instead of 2.2

 

[Rich85]

dont foget AMD rate there chips 3200+ 3500+ on the basis of the RAM freq which is ddr400 so you can not bring HTT into play when trying to brand a chip, as this is set into play by JEDEC

 

[mwmorph]

wahts the formula for s754, 256k cache?

wait, its
1450 x cpu ghz x .95 if it is 256k

 

[AthlonAlien]

Let's assume you had 2 CPUs, both running at 2.6GHz. Both CPUs have 512KB of cache.

CPU 1 - 260 x 10 = 2.6GHz

CPU 2 - 200 x 13 = 2.6GHz

Wouldn't CPU 1 be faster? I am not saying it would be like comparing a 80486 to a Pentium 4... it just seems to be that CPU 1 would be a little bit faster... Is this correct? If so, that is what my initial question was directed towards... I am wanting to know if there is any way (or formula) to find out the performance boost of 260 vs. 200?!

I know the PR rating is just to let the public know what Intel chip the AMD part will combat. That's cool...

-Thanks

 

[Gamingphreek]

Originally posted by: mwmorph
wahts the formula for s754, 256k cache?

wait, its
1450 x cpu ghz x .95 if it is 256k

Well only Sempron has 256K of cache. Also simply look at the speed of your processor. THe formulas i have simply convert it to compare with the AXP Bartons and the Intels.

-Kevin

 

[mwmorph]

Originally posted by: Gamingphreek

Originally posted by: mwmorph
wahts the formula for s754, 256k cache?

wait, its
1450 x cpu ghz x .95 if it is 256k

Well only Sempron has 256K of cache. Also simply look at the speed of your processor. THe formulas i have simply convert it to compare with the AXP Bartons and the Intels.

-Kevin

I have a 3300+ athalon 64. it is 2.4ghz, 256k cache paris core. s754.
with my formula, it comes out to a 3304 rating.

 

[Gamingphreek]

Where are you pulling this formula from. Also i vaguely remember a 3300+ but it was sold to only a few retailers.

What is a 1450 for. I mean you seem to just be pulling numbers out of your head. What PR rating is this compared to, what performance is this comparing to.

-Kevin

 

[thunderroller]

can i run this for long time say about 6 hrs

 

[Duvie]

Originally posted by: AthlonAlien
Zebo (or anyone)

I have noticed Zebo's formula for calculating AMD's cpu performance...

(formula)
1500 x CPU Speed x 1.05 (if Dual Channel) x 1.05 (if 1MB Cache) = PR Rating (round)

(example) Athlon 64 3500+ @ 2.610 (290 x 9)
1500 x 2.200 x 1.05 = 4110.75 (4100+)

Here's my question... I have seen several benchmarks showing the example CPU edging out a FX-55 (4200+). I know the difference must be because of the FSB/HTT speed (and the RAM bandwidth that goes with it at 1:1). I was wondering if there was a way or a new modified formula (ver 2.0 ) to factor in the FSB/HTT speed? I am just curious...

-Thanks

Dude you math is all fvcked up

1500 x 2.2 = 3300 x 1.05 = 3465!!! 410.75??$#$@#@

I think you meant:

1500x 2.61 = 3915 x 1.05 = 4110.75

1500 x 2.6 = 3900 x 1.05 (dual channel) = 4095 x 1.05 (1mb cache) = 4299.75

Does seem a bit off if the FX55 is supposed to be 4200+

 

[AthlonAlien]

Finally, someone actually attempting to leave some type of a helpful reply...

Duvie, you are correct... that was a typo. I meant 2.61 (NOT 2.2) LOL! But, now you see what I am talking about... both running at 2.60 or 2.61... one is a 4100+ the other a 4300+... and the only difference is 512KB of cache...?