[QUOTE=petrw1;471795]My plan is to move all 4 existing 2GB sticks to 1 PC.[/quote]

A good idea. Have you confirmed they have 4 memory slots?

[quote]I have in my possession an 8GB and a 4GB from another factory built PC. I assume they match.
I plan to buy another matching 4GB and place 8 and 2X4 in the other PC.[/QUOTE]

That's probably okay.

Benchmark these combinations to see what gives you the best performance:

4-8-4-0
4-0-4-0
4-4-0-0
4-4-8-0

with the first slot being the one closest to the CPU.

[QUOTE=Mark Rose;471831]A good idea. Have you confirmed they have 4 memory slots?

That's probably okay.

Benchmark these combinations to see what gives you the best performance:

4-8-4-0
4-0-4-0
4-4-0-0
4-4-8-0

with the first slot being the one closest to the CPU.[/QUOTE]

Yes - 4 slots

Are you suggesting the channel pairs may not be intuitive?
Do you mean to have 16GB in all 4 scenarios or is there a reason 2 of them only have 8?

Thanks

First is up and running
 

This new i5-3570 has very similar benchmarks to my i5-3570K before I OC'd it from about 3600 to 4200.
I still need to add some RAM to this first one.

Then I want to move the GPU from an older CPU to the second new one.
Along with more RAM as well.

BTW: After 2 years of having it, this is the first time I opened the case to this GPU purchased from another GIMPS Member. For 2 years I was under the belief it was a GTX-780.

BUT....the GPU is clearly labeled GTX-980.
That would explain the 520-560 GhzDays / Day output from it.

A pleasant surprise on the GPU!

EDIT: Is the 980 running stock? An OC'd 1060 (2012 MHz ATM) stabilizes at 640-644 MHz. If the 980 is relatively "stock" you could probably get considerably more from it.

[QUOTE=petrw1;471833]Yes - 4 slots

Are you suggesting the channel pairs may not be intuitive?
Do you mean to have 16GB in all 4 scenarios or is there a reason 2 of them only have 8?

Thanks[/QUOTE]

If you have 4 slots (with that cpu), then you have 2 slots for each memory channel. The slots will be mapped either ABAB or AABB. Obviously you want each channel to have as much memory as the other so that the memory can be interleaved properly for maximum performance. But I don't have a manual for your motherboard to indicate what the slot mapping is.

You were talking about getting a matched 4 GB module and using that along with your 8 GB module. Two of my suggestions are for just the 4 GB sticks, and the other two are for adding in an 8 GB stick. It's possible adding the 8 GB stick may lower performance (due to there possibly being fewer memory ranks on the stick), so that's why I also suggest benchmarking with and without it :)

[QUOTE=kladner;471924]A pleasant surprise on the GPU!

EDIT: Is the 980 running stock? An OC'd 1060 (2012 MHz ATM) stabilizes at 640-644 MHz. If the 980 is relatively "stock" you could probably get considerably more from it.[/QUOTE]

I only tweaked the parms in the MFAKTC document (threads, etc)

[QUOTE=Mark Rose;471952]If you have 4 slots (with that cpu), then you have 2 slots for each memory channel. The slots will be mapped either ABAB or AABB. Obviously you want each channel to have as much memory as the other so that the memory can be interleaved properly for maximum performance. But I don't have a manual for your motherboard to indicate what the slot mapping is.

You were talking about getting a matched 4 GB module and using that along with your 8 GB module. Two of my suggestions are for just the 4 GB sticks, and the other two are for adding in an 8 GB stick. It's possible adding the 8 GB stick may lower performance (due to there possibly being fewer memory ranks on the stick), so that's why I also suggest benchmarking with and without it :)[/QUOTE]

Found this in the user guide:

[CODE]
10 DIMM4 (Channel A) DIMM4 white Memory Module
11 DIMM3 (Channel A) DIMM3 black Memory Module
12 DIMM2 (Channel B) DIMM2 white Memory Module
13 DIMM1 (Channel B) DIMM1 black Memory Module
[/CODE]

I'm thinking there might be a preference to use DIMM1 first so might I put from top to bottom: x-8 4-4 ??

Or does it not matter as long as A and B each have same 8GB?

[QUOTE=kladner;470701]I have found 5 factors in DC TF since I started on 2017-09-30. Two were within the last 12 hours. :smile:

EDIT: I miscounted. Make that 6 factors. :big grin:[/QUOTE]
Now 15. :smile:

[QUOTE=kladner;471957]Now 15. :smile:[/QUOTE]

:tu:

[QUOTE=petrw1;471956]Found this in the user guide:

[CODE]
10 DIMM4 (Channel A) DIMM4 white Memory Module
11 DIMM3 (Channel A) DIMM3 black Memory Module
12 DIMM2 (Channel B) DIMM2 white Memory Module
13 DIMM1 (Channel B) DIMM1 black Memory Module
[/CODE]

I'm thinking there might be a preference to use DIMM1 first so might I put from top to bottom: x-8 4-4 ??

Or does it not matter as long as A and B each have same 8GB?[/QUOTE]

Did so....got second i5-3570 working.
I did a benchmark and compared the times of the first new i5-3570 with 4x2GB of stock RAM to this new one with 2x4GB + 1x8GB that I added. The Benchmark times show that the stock PC is about 1% faster. I can live with that. I think it indicates the Dual Channel is working in the second new PC.

PS ... Thanks for everyone's help.

PPS. Anyone have a spare Solar Power generator laying around :)

Next Thursday I’ll be visiting Hinkley Point C nuclear power station in UK. Should be exciting, hoping for a bus tour and meetings to plan further work there as an energy consultant.