Ed Cryer wrote:
Paul wrote:
Ed Cryer wrote:
Andy Burns wrote:
Ed Cryer wrote:
The four are all the same; all 1600MHz, DDR3, 8GB.
Well, theoretically they are fine for that MB.
https://www.corsair.com/uk/en/Categories/Products/Memory/Mainstream-Memory/Corsair-Memory-%E2%80%94-8GB-DDR3-Memory/p/CMV8GX3M1A1600C11
Try a pair of the new ones in the blue slots at the tested speed
of 1333MHz 9-9-9-24
if that works then all four at that speed.
if that works, try two and finally all four of them
at the XMS speed of 1600MHz 11-11-11-30
I've not used an AMD CPU for years, so I'll take Paul's word for it
that a quad SIMM configuration is tricky. I have no issues with
4x8GB on "workstation" class intel motherboards.
Thanks for this. This sounds practical.
I shall try them, as you say.
Please explain "9-9-9-24"; and tell me how to set the speed.
Ed
9-9-9-24
tCAS tRCD tRP tRC
In roughly the same order as your DRAM customization screen.
The numbers are counts of "cycles".
At 1600MHz, the inverse is 0.6ns. 9 cycles at 0.6ns is 5.4ns.
Internally, all the RAM understands is nanoseconds.
"Did you meet my 5.4ns minimum ???" it asks.
If the RAM is set to DDR1333, the inverse of that is 0.75ns.
To make a number close to 5.4ns, we need about 7.2 cycles.
Rounding up, 8 cycles would work, without causing a smaller
number than the 5.4ns minimum.
9-9-9-24 DDR3-1600 or 8-8-8-X DDR3-1333
The timing table you can see in CPUZ shows
example timings that are recorded in the SPD
for this. Other values can be done by the BIOS
code by interpolation and so on.
Paul
Here are the SPD tabs of CPU-Z for the two working modules.
Any comments?
https://www.dropbox.com/s/1d8v4h5mji...ts2-4.png?dl=0
Ed
Assuming those two samples are DIMMs from different
sets, they're very close to one another at the top setting.
You could start by using the frequency setting, and
let the BIOS do the math on the individual timings.
*******
AI Overclock Tuner [Manual]
Memory Frequency [DDR3-1600] === Start with 1600, switch to 1333 if
there is trouble, let the BIOS do the
math for the rest.
DRAM Timing Control [example at 1600]
tCAS Auto (11)
tRCD Auto (11)
tRP Auto (11)
tRC Auto (41)
DRAM Command Rate 2T === definitely want 2T
DRAM Voltage [1.50V] === You should be able to use between
1.5 and 1.65V without issue.
NB Voltage [Auto] === Leave this for now
If that doesn't work: 11-12-11-41
tRCD 12
DRAM Voltage [1.65V]
If that doesn't work
tCAS 12
tRCD 12
tRP 12
tRC Auto === let BIOS work it out
Sometimes, the error rate and whether the errors are exactly
reproducible on each run, hints at whether the RAM chips
have an issue, or the bus timing is flaky, or the Vnb needs
to be adjusted up a notch or two. The Vnb regulators now
have fairly tiny step sizes and are capable of fine adjustment.
*******
While your board has an "auto overclock" kind of feature,
I don't like the voltages or extreme settings those tend to use.
Yes, if you jam the controls to max, you can practically
guarantee an overclock, and the methods they use on these
boards aren't exactly "subtle". Still, if you read an article
somewhere that says the method used is good, I won't argue
with that.
I try to sneak up on the settings if I can, and prefer
to not apply extreme voltages if I can avoid it. My previous
set of "hot DIMMs" had a problem, so I'm trying to not make
any more "hot DIMMs" on purpose by using extreme settings.
When the RAM on the machine started throwing errors a couple
of sets of RAM ago, I used Vnb as the only setting, to fix it.
Nothing else needed to be adjusted. I could do this though,
because I was working on a theory that the Northbridge was aging.
I knew the settings I'd used for everything else, were fine
at the time of the build.
Normally, the board will be selecting Command Rate 2T on its
own, whether because the DIMM clock is rather high, or
because the bus is loaded (four DIMMs). There's hardly a chance
to realistically use 1T (maybe a single set of single sided
4GB DIMMs).
Maybe you'll have more joy at 1333, with a full set.
Some older AMD setups used to work that way, DDR400
with two DIMMs, DDR333 with four DIMMs.
HTH,
Paul