I have a new Dell Precision M4800 computer - the memory for it was spec'd at 1866MHz.
When I ran the Dell built-in (to the BIOS) diagnostics, though, it reported the memory speed is 1600MHz. This caused me some concern that perhaps I had gotten the wrong memory chips.
However, when I look at the system information in the BIOS Setup, it reports the memory speed is 1867MHz, i.e., the spec. So which is correct?
So I ran the diagnostic tool memtest86+ -- it reported 1600MHz like the Dell diagnostic.
Then I ran Speccy - it says the memory "DRAM Frequency" is 932.2MHz (which happens to be almost exactly half of 1866MHz). It also says it's "Dual Channel".
Is the spec'd memory speed of 1866MHz the product of the "DRAM Freq" times "# of channels"? if so, then Speccy would support that it is as spec'd.
But I still don't know why the built-in Dell diagnostic & memtest86+ both report 1600MHz.
So my questions are:
1) How can I definitively determine the RAM speed so I know if I got what I paid for?
2) Why do I get differing results from different tools?
I also ran CPU-Z as suggested in one answer and under "General" it reports "NB Frequency" is 799.0 MHz and under "Timings" it reports 932.2MHz (same as Speccy). It also reports "Channel #" as "Dual", like Speccy.
took out the memory & checked. Here are the pictures of both sides:
According to the sticker it IS 1866MHz. So why do the diagnostics say 1600MHz? And does the processor really take advantage of the extra speed? If not, why do Speccy & CPU-Z give the better timings?
I found a Part Number Decoder at this address: http://www.skhynix.com/inc/pdfDownload.jsp?path=/upload/products/gl/products/dram/down/DDR3.pdf
According to that, the PBA appearing under the long part number in the photo above means that the chips are:
PB - 1600 MHz A - : Commercial Temp1) & 1.35 VDD (1. 0°C ~ 85°C)
If that is true, that explains why Speccy, CPU-Z and Dell Diagnostics report 1600 MHz as the speed. This suggests the sticker is mislabeling since it says 1866MHz. I still don't know how/why the Memory timings from Speccy & CPU-Z indicate that it is operating at (or close to) 1866MHz. Nor do I understand if the CPU can take advantage of the increased speed (if it exists).
I have written to the chip manufacturer to confirm I am decoding it correctly. I will also write Kingston.