- Joined
- Sep 16, 2003
- Location
- Knoxville, TN
Ive been mulling around if I should get a 2600K now or wait for Ivy Bridge. One thing I noticed is how similar this time feels to when Kentsfield was moved to Penryn; so I decided to use a little avaition fuzzy math to try and rationalize whether it was going to be worth buying or not. I think the data I produced is really quite interesting and I decided to share. What I used were a couple reviews but they werent as detailed as I wanted however; using Anandtech review numbers for Q6600 and Q9650 I was able to notice a lot of interesting info...
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TLDR:
Expected New Average Overclock for IB: 4885 + 5328 /2
= 5.106ghz
Expected Stock Clocks For i7 3700K
= 4.0 / 4.4
So is Ivy Bridge worth it? If you are at 5ghz no, 4.5? Most likely yes.
Clarkfield - 2.4 <> 3.5 (32% overclock of base freq)
Penryn - 3.0 <> 4.0 (25% overclock of base freq)
Process difference 3.5 <> 4.0 (13% increase of max oc)
= 13% increase for 30% shrink (going from 65nm to 45nm)
Sandybridge - 3.4 <> 4.8 (30% overclock of base freq)
Ivybridge - ? <> ?
That said these numbers look erriely similiar so one could intreperate these as 1:1 with a slight rounding error
If a die shrink from 65nm to 45nm = 30% = 13% max freq increase
Die shrink from 32nm to 22nm = 32% = 13/30 = .43 X 32 = 13.86% max freq increase
Expected Ivy Bridge per Anandtech = 4800 X .1386 = 665.28 + 4800 = 5468.28
Now to find base clock:
2400/3000 = 20% increase
3400 X .20 = 4080 (round off to 4000)
Expected E3700K = 4.0 base
Turbo?
2500k = 3.3 -> 3.7 = 11%
2600k = 3.4 -> 3.8 = 11%
So therefor = 4000 x .11 = 440 + 4000 = 4440 rounded = 4400
Expected E3700K = 4.0 Base 4.4ghz Turbo
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Extrapolating based on personal results
Clarkfield Q6600 - 2.4 <> 3.2 (25%)
Penryn Q9400 - 2.6 <> 3.5 (24%)
Average 24.5% vs 32% / 25%
Process difference based on personal results = 9% vs 13%
I tend to not have very good overclocking chips as I purchase them at release and heat has always been a factor
So lets average them together
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Expected Ivybridge clocks for 3700K based on realistic data (mine) with max overclock @ 4.5ghz
Low = 4905mhz @ 9%
Median = 4995mhz @ 11%
High = 5085mhz @ 13%
Expected Ivybridge clocks for 3700K based on optimistic data (Anandtech) with max overclock @ 4.8ghz
Low = 5232mhz @ 9%
Median = 5328mhz @ 11%
High = 5468mhz @ 13%
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TLDR:
Expected New Average Overclock for IB: 4885 + 5328 /2
= 5.106ghz
Expected Stock Clocks For i7 3700K
= 4.0 / 4.4
So is Ivy Bridge worth it? If you are at 5ghz no, 4.5? Most likely yes.
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