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differene between intel 3rd generation i7and 4th generation i7

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June 4, 2013 10:26:21 PM

What is the major differene between intel 3rd generation i7 and 4th generation i7 (Laptop & Desktop)
a c 116 à CPUs
June 4, 2013 10:40:08 PM

Double the L1/L2/L3 cache bandwidths, double the cache associativity, two extra instruction issue ports, 24 extra instruction (192 vs 168) in the reordering buffer, improved branch prediction, Fully-Integrated Voltage Regulator (FIVR), significantly improved IGP...

Plenty of fairly significant improvements architecturally-speaking but all of those only yield a ~7% improvement in most current games and applications so not really worth upgrading to if you already have a SB/IB desktop/laptop. The extra complexity and heat from on-chip VRM also make Haswell more difficult to cool and overclock.

Due to double-VRMing and FIVR's relatively low efficiency, Haswell also looks like it will use 10-30W more power than Ivy Bridge under heavy load.
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a c 210 à CPUs
June 4, 2013 10:53:17 PM

About 4-6% improvement in CPU performance, and a minor upgrade of the iGPU you won't use for gaming anyway.

There were some architecture changes, but nothing that makes performance significantly better...you're better off not upgrading...if you're building a new build, you're better off with Ivy Bridge or AMD.
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a c 116 à CPUs
June 4, 2013 11:37:04 PM

8350rocks said:
There were some architecture changes, but nothing that makes performance significantly better...

While there is no denying the results were modest, the changes themselves were quite extensive and technically significant. That's what makes Haswell so depressing.

It simply shows that squeezing any more IPC/ILP out of individual x86 threads is becoming as difficult as squeezing water out of rocks.
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June 4, 2013 11:50:41 PM

2_b said:
What is the major differene between intel 3rd generation i7 and 4th generation i7 (Laptop & Desktop)


how about dollar$ 55.
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October 18, 2013 6:34:47 PM

it looks like 4th generation can get hot. Nothing is worth it if the processor can get hot right?
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a b à CPUs
October 18, 2013 9:08:13 PM

Dunno what you are talking about - 57c max when gaming on stock I7-4770 on air. That's hot?
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a c 210 à CPUs
October 20, 2013 9:39:02 AM

Gaidax said:
Dunno what you are talking about - 57c max when gaming on stock I7-4770 on air. That's hot?


They're talking about overclocking. It does run quite a bit hotter than SB or IB.
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April 24, 2014 7:38:17 PM

Go with the 3rd gen 6-8 mb cache for desktop, 4th gen 6 mb cache for laptop. 4th gen is mostly better battery life and upgraded integrated GPU from what i understand. Has to do with Intel's tick tock principle. Be careful of the i7 4500u and i7 4600u. They only come with 4 MB cache and are duel core. Terrible for gaming!
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