Low performance RAM

Schaefer47 · Apr 24, 2018

I recently carried out a UserBenchmark analysis of my rig where I got the below evaluation of my rig:

Kingston HyperX DDR3 1866 C9 2x8GB
2,184 User benchmarks, average bench 57%
2 of 2 slots used
16GB DIMM DDR3 clocked @ 1600 MHz
Performing way below expectations (11th percentile)

My CPU is:

Processor (CPU)
CPU Name Intel® Core™ i7-4771 CPU @ 3.50GHz
Threading 1 CPU - 4 Core - 8 Threads
Frequency 2194.76 MHz (22 * 99.76 MHz) - Uncore: 2194.8 MHz
Multiplier Current: 22 / Min: 8 / Max: 39
Architecture Haswell / Stepping: C0 / Technology: 22 nm
CPUID / Ext. 6.C.3 / 6.3C
IA Extensions MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, EM64T, VT-x, AES, AVX, AVX2, FMA3
Caches L1D : 32 KB / L2 : 256 KB / L3 : 8192 KB
Caches Assoc. L1D : 8-way / L2 : 8-way / L3 : 16-way
Microcode Rev. 0x000001E
TDP / Vcore 84 Watts / 0.838 Volts
Temperature 100 °C / 212 °F
Type Retail (Stock Frequency : 3500 MHz)
Cores Frequencies #00: 2194.76 MHz #01: 2194.76 MHz #02: 2294.52 MHz #03: 2194.76 MHz
Motherboard
Model Asus H81M-K
Socket Socket 1150 LGA
North Bridge Intel Haswell rev 06

I am aware that this is an older CPU but as I specifically use it for FSX Flight Simulator I have been upgrading slowly and (apart from getting a new Motherboard and Chip (i58600)) I am only looking to achieve a stable platform for FSX.

I did the test as I have been proposed that by installing a Samsung EVO 850 250gb for my OS (Win10 Enterprise) I would get better speeds on the OS and aplication management side than by upgrading the motherboard. (At least within my budget).

Any comments as to why the RAM seem to be performing so poorly would be helpful.
I have initiated XMP in the BIOS and am running Process Lasso to control the FSX cores (basically moving this application off core 0 and1.

Thanks in advance for your comments.

Schaefer47

Karadjgne · Apr 24, 2018

H81m-k only supports 1066/1333/1600. Cpu only supports 1066/1333/1600. With XMP on, the RAM can be set at any speed available according to its jadec tables, if it was ddr3 2666 the ram could be set at 2666 without issue, but the cpu/mobo is only going to recognise 1600 at best and that'll be the actual speed of the ram.

You'll need a Z87/Z97 motherboard for the bios to accept (OC) ram values and run them at that speed. Cpu will probably accept 1866MHz just fine and remain stable, no guarantees, without any need for cpu OC to provide added power to deal with the higher clocks (that's what the (OC) on the ram stats suggests)

Schaefer47 · Apr 25, 2018

Karadjgne :

H81m-k only supports 1066/1333/1600. Cpu only supports 1066/1333/1600. With XMP on, the RAM can be set at any speed available according to its jadec tables, if it was ddr3 2666 the ram could be set at 2666 without issue, but the cpu/mobo is only going to recognise 1600 at best and that'll be the actual speed of the ram.

You'll need a Z87/Z97 motherboard for the bios to accept (OC) ram values and run them at that speed. Cpu will probably accept 1866MHz just fine and remain stable, no guarantees, without any need for cpu OC to provide added power to deal with the higher clocks (that's what the (OC) on the ram stats suggests)

Schaefer47 · Apr 25, 2018

Thanks for getting back to me.

I did revisit the XMP/RAM settings and brought the RAM down to 1600, which did improve the baseline performance a couple of percent.

Looking at the Z87/Z97 motherboard options I don't really see much improvement even if I move up to a MSI Z87 with a i5 4790 which would cost around
€470.
My dealer is pushing a new mb (coming soon) with a i5 8600 with new 16gb RAM at around €530.

My current thinking is to install the EVO 850 250gb at a cost of about € 85 which should provide a much faste speed regarding system and application loading.

After all we are still talking an old program and basically the i74771 was considered perfect for FSX when it came out.

I really appreciate your insights and thanks for taking the time to answer an old dodger like me (71). Now I just need to work out how to clone my system files from a Hybrid HDD...

Thanks again.

regards

Schaefer47

Karadjgne · Apr 25, 2018

For €530, the i5-8600 is a far better value than the i7-4790.

DDR4 is faster per clock.
The i5 has @20% or better IPC than the i7. Basically each thread is 20% faster.
The way hyperthreading works is by splitting the core bandwidth, pushing 2x threads simultaneously, but if the threads take up too much bandwidth, you end up with only 1 thread per core. Pretty much count on 8 thread hyperthreaded cpus acting with the same speed as 6 full cores. The i5 is a full 6 core cpu, so for multi thread apps is stronger than the quad core + hyperthreading and then make it 20% faster still.

The 4790 is only @5% better than the 4771 at best, so you'd not really see any improvement there, just the ability to use faster ram. You can't OC the cpu other than BCLK, (not advised, little gains) as its not a K unlocked multiplier cpu. There's nothing really recommending about the Haswell - Haswell swap at that price point.

Schaefer47 · Apr 26, 2018

Hi Karadjgne,

Your analysis is correct and confirms that I have an upgrade route for my PC should that be necessary.

I originally bought the PC second hand for €200 specifically for FSX and have upgraded from 8GB RAM to 16GB, exchanged the GTX680 to the GTX 1060 6GB (OC'ed by using MSI Afterburner). This was the highest I could go with this CPU.
I feel that, at the moment, I am happy to install the small SSD to handle System, Windows and the FSX application to improve loading speeds.

Should the Haswell 4771 or mb burn out then I would be looking at changing these items along the path you have described.

My first PC was a Digital Rainbow and I started out maintaining IBM S34s so I have been working with IT projects most of my life and if currently if it is not broken I tend to not fix it.

Thanks again for your support.

Regards

Schaefer47

Karadjgne · Apr 26, 2018

No worries, my first pc was a Vic20, Commodore 64... and my current gaming pc is a i7-3770k with a gtx970 on 1080p. Almost 6 yrs now and still does what I need it to do. So I totally get the 'if it ain't broke' way of thinking.

I figure by the time I need to upgrade, FSXX will be out, and pc's will be little boxes made of light, not silicon.

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