Latency typically means squat for the IGP (or at least way less important than bandwidth).
FWIW I've wondered about some gpu scores in the reviews - that is not just individual benchmarks but some reviews seemed to show not much of an improvement in general wheras others said it's like a 40% improvement in in just about anything...
Also I think intel only officially supporting up to ddr4-2133 is "slightly" on the low side and disappointing - that's literally the slowest ever built! Sure the server platform doesn't support more neither but it would be quite expected this platform lags behind on that aspect. Granted for the cpu part it doesn't really matter but the IGP could always benefit from it...
I just did a quick look at ATs set up here is what I found
Corsair DDR4-2133 2x8
G.Skill DDR4-2133 2x8
G.Skill DDR3-1866 4x4
*Memory Timings used were the supported frequencies of each architecture,
except DDR3L vs DDR4 testing, which used DDR3-1866 C9.
For Skylake's DDR3L requirement, this was a DDR3 kit running with an undervolt to 1.42V.
At 1.5V, the system failed to boot.
Are you sure about this? I thought the ddr3 was at 1600mhz and the ddr4 was at 2133mhz.
edit - the DDR3 is at 1866 cl9 and the DDR4 is at 2133 cl15.
edit 2 - IIRC DDR3 latency = 4.82ns DDR4 will equal 7.03ns
edit 3 - I was corrected below haswell @ 1600 which makes sense as it's the default mem clock for it.
Originally Posted by
Walter E Kurtz
Hardware Canucks uses DDR3 1866 Cas 11 and DDR4 2666 CAS 13(!). That is not even close. Hothardware and PcPer don't even post CAS latency under test system setup so god knows what they are testing. There are plenty of reviews where the memory difference between Haswell / Skylake comparison was reduced as much as possible, including here on anandtech showing the real IPC gain to be nowhere near the "usual" 10-15%
Let's see what Anandtech said about their RAM, since you allege that Anandtech reduced difference in RAM "as much as possible".
http://anandtech.com/show/9483/intel...h-generation/7
How to measure performance, according to AT:
Quote:
Normally in our DRAM reviews I refer to the performance index, which has a similar effect in gauging general performance:
DDR3-1600 C11: 1600/11 = 145.5
DDR4-2133 C15: 2133/15 = 142.2
As you have faster memory, you get a bigger number, and if you reduce the CL, we get a bigger number also. Thus for comparing memory kits, if the difference > 10, then the kit with the biggest performance index tends to win out, though for similar kits the one with the highest frequency is preferred.
Performance index=frequency/CAS, supposedly.
And now the RAM they chose:
Quote:
For these tests, both sets of numbers were run at 3.0 GHz with hyperthreading disabled. Memory speeds were DDR4-2133 C15 and DDR3-1866 C9 respectively.
DDR4: 2133/15=142.2
DDR3L: 1866/9=207.3
A difference of 65 in favor of DDR3L
Compare these to the "not even close" RAM that Hardware Canucks chose:
DDR4: 2666/13=205.1
DDR3L: 1866/11=169.6
A difference of 39 in favor of DDR4
It looks to me like Hardware Canucks' choice of RAM is actually significantly closer than Anandtech's.