i5-6400 vs 6600 (for prime hunting)

[Fred]

Originally Posted by axn

http://ark.intel.com/compare/88185,88184,88188

I'm sure this is a noob quesiton, but when they list "memory types" in the above linked table, such as "DDR4-1866/2133, DDR3L-1333/1600 @ 1.35V" for the 6500, it's confusing to me. Clearly folks are using DDR4 faster than 2133 with this cpu... so what do they mean by "DDR4-1866/2133"?

[Mark Rose]

Those are the officially supported memory speeds. Anything faster is considered a memory overclock.

[xtreme2k]

I am actually surprised the difference between 6700K and others (6600/K/6500) are quite huge in applications such as rendering, encoding, sysmark and others. (Ignoring P95 for now)
Their costs difference is around $150, As a % of the overall system is only going to be about 10-15% (say a system for about $1K-1.5K), and yet you are taking a hit up to around 30% (up to around 40-45% in worst case) in performance.

http://anandtech.com/bench/product/1543?vs=1544
http://www.cpu-world.com/Compare/500..._i7-6700K.html

[LaurV]

Originally Posted by xtreme2k

Their costs difference is around $150, As a % of the overall system is only going to be about 10-15% (say a system for about $1K-1.5K), and yet you are taking a hit up to around 30% (up to around 40-45% in worst case) in performance.

Fixing the dollar bug for you...
edit: here much worse, due to it causes missing important text, because the % is treated as comment

[henryzz]

Originally Posted by xtreme2k

I am actually surprised the difference between 6700K and others (6600/K/6500) are quite huge in applications such as rendering, encoding, sysmark and others. (Ignoring P95 for now)
Their costs difference is around $150, As a % of the overall system is only going to be about 10-15% (say a system for about $1K-1.5K), and yet you are taking a hit up to around 30% (up to around 40-45% in worst case) in performance.

http://anandtech.com/bench/product/1543?vs=1544
http://www.cpu-world.com/Compare/500..._i7-6700K.html

Does anyone have one? It would be interesting to see if that carries over to Prime95 at all.

[Prime95]

Originally Posted by xtreme2k

I am actually surprised the difference between 6700K and others (6600/K/6500) are quite huge in applications such as rendering, encoding, sysmark and others.

My estimate (based on Haswell data) is the 6700K would be about 7% faster than the 6600 paired with DDR4-3200.

Not enough faster to justify the extra upfront cost and electricity.

[VBCurtis]

Originally Posted by xtreme2k

I am actually surprised the difference between 6700K and others (6600/K/6500) are quite huge in applications such as rendering, encoding, sysmark and others. (Ignoring P95 for now)
Their costs difference is around $150, As a % of the overall system is only going to be about 10-15% (say a system for about $1K-1.5K), and yet you are taking a hit up to around 30% (up to around 40-45% in worst case) in performance.

http://anandtech.com/bench/product/1543?vs=1544
http://www.cpu-world.com/Compare/500..._i7-6700K.html

On most of the benchies at anandtech, the difference in scores is less than the difference in clockspeeds, as one would expect when a bench is even slightly memory-bottlenecked. Cherry-picking the biggest-difference scores only matters if you do those specific things with your machine. Do you? We do not.

"up to 30%" is not an average. try averaging all the scores for every benchie listed; eyeballing it gets me about 15% faster, in line with clockspeed increase. I haven't built a $1500 system since the 90s; even my 6-core i7 came in around $1000, so looks like more than a 15% increase in system price for most folks. If you're planning on a $500+ video card to reach $1500 system price, that's your business- but if you are, those games sure aren't going to run 15% faster either.