I worked on this for some time now, and I found a mostly perfect way to get the REAL Athlon 64 rating versus Pentium 4. We all know that the AMD rating is quite optimistic and it is sometimes misleading. Athlon XP are a very good example of it.
So, I decided to take into account the performance of Athlon 64 and P4 in various applications and I have normalized the results. Of course, Athlon will still get beat in Video/Audio encoding and P4 will still trail in most games. But my overall "Enhanced Athlon 64 Rating" gives a better overall view. A more realistic view based ona wide range of applications.
<b>Here is the maths…</b>
You need these Athlon 64 informations : Speed, Cache Size and Socket Type.
X = <font color=red>Speed / 100</font color=red>
Y = Cache Size (in KB) / 512
If Socket = 754 then Z = -1
If Socket = 939 then Z = 1
If Socket = 940 then Z = 0
<font color=red>If Speed >= 2.4GHz then S = 1 else S = 0</font color=red>
Enhanced Athlon 64 Rating = (X + Y + Z <font color=red>+ S</font color=red> + 9) * 100
9 is the offset to compensate Athlon 64 lower speed.
<font color=red>"S" is needed for the non-linear scaling of performance vs speed.</font color=red>
Here is an example of this equation :
Athlon 64 3200+ (S754/1Megs)
X = <b>2000</b>/100 = 20
Y = <b>1024</b>/512 = 2
Z = -1 for <b>S754</b>
S = 0 for <b>2.0GHz</b>
X + Y + Z + S + 9 = 30
30 * 100 = 3000+
So the Athlon 64 3200+ lost 200 point in this new rating, but overall, this Athlon 64 would be a better P4C/E 3.0GHz competitor. As I stated before, the A64 would crush the P4 in games, but it would not get that badly beatin by the P4 in other disciplines where the P4C/E shines.
With this "Enhanced Rating", the Athlon 64 rating move from 2800+/3800+ to 2700+/3600+. Overall there is no big change, just a little correction to some overated Athlon 64 (see 3500+). By the way, you can calculate the Athlon FX-53 rating with my equation. It can be compared to a 3700+.
NOTE : <A HREF="http://www.hardware.fr/articles/496/page12.html" target="_new">The graphic on this page</A> inspired me in this search for a better rating.
<font color=red>UPDATES :
- I forget the "S" in my first post.
- I changed a bit the way to calculate the X. I know based it on speed instead of the multiplier, this helps evaluate the rating of overclocked Athlon 64. The only thing I need to evaluate now, is how the FSB overclock affect the overall rating, but I would need testing and overclocking numbers to figure this out. I don't think it impact the overall rating by much, but I know it impact it a bit.</font color=red>
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What's the <b><font color=green>AMD Mobile Athlon 64</font color=green></b> overclocking potential? <b>It's huge!</b><P ID="edit"><FONT SIZE=-1><EM>Edited by TheRod on 06/04/04 08:12 AM.</EM></FONT></P>
So, I decided to take into account the performance of Athlon 64 and P4 in various applications and I have normalized the results. Of course, Athlon will still get beat in Video/Audio encoding and P4 will still trail in most games. But my overall "Enhanced Athlon 64 Rating" gives a better overall view. A more realistic view based ona wide range of applications.
<b>Here is the maths…</b>
You need these Athlon 64 informations : Speed, Cache Size and Socket Type.
X = <font color=red>Speed / 100</font color=red>
Y = Cache Size (in KB) / 512
If Socket = 754 then Z = -1
If Socket = 939 then Z = 1
If Socket = 940 then Z = 0
<font color=red>If Speed >= 2.4GHz then S = 1 else S = 0</font color=red>
Enhanced Athlon 64 Rating = (X + Y + Z <font color=red>+ S</font color=red> + 9) * 100
9 is the offset to compensate Athlon 64 lower speed.
<font color=red>"S" is needed for the non-linear scaling of performance vs speed.</font color=red>
Here is an example of this equation :
Athlon 64 3200+ (S754/1Megs)
X = <b>2000</b>/100 = 20
Y = <b>1024</b>/512 = 2
Z = -1 for <b>S754</b>
S = 0 for <b>2.0GHz</b>
X + Y + Z + S + 9 = 30
30 * 100 = 3000+
So the Athlon 64 3200+ lost 200 point in this new rating, but overall, this Athlon 64 would be a better P4C/E 3.0GHz competitor. As I stated before, the A64 would crush the P4 in games, but it would not get that badly beatin by the P4 in other disciplines where the P4C/E shines.
With this "Enhanced Rating", the Athlon 64 rating move from 2800+/3800+ to 2700+/3600+. Overall there is no big change, just a little correction to some overated Athlon 64 (see 3500+). By the way, you can calculate the Athlon FX-53 rating with my equation. It can be compared to a 3700+.
NOTE : <A HREF="http://www.hardware.fr/articles/496/page12.html" target="_new">The graphic on this page</A> inspired me in this search for a better rating.
<font color=red>UPDATES :
- I forget the "S" in my first post.
- I changed a bit the way to calculate the X. I know based it on speed instead of the multiplier, this helps evaluate the rating of overclocked Athlon 64. The only thing I need to evaluate now, is how the FSB overclock affect the overall rating, but I would need testing and overclocking numbers to figure this out. I don't think it impact the overall rating by much, but I know it impact it a bit.</font color=red>
--
What's the <b><font color=green>AMD Mobile Athlon 64</font color=green></b> overclocking potential? <b>It's huge!</b><P ID="edit"><FONT SIZE=-1><EM>Edited by TheRod on 06/04/04 08:12 AM.</EM></FONT></P>