Resolved Does it mean that the CPU cannot support DDR3 1600/1066?

The 'Rule of thumb' with RAM is - don't MIX Brands or types.
Buy 'matched' pairs/sets from the manufacturer.
Use the 'type' of RAM recommended by the Motherboard maker. Neil.

 

I had found the answer to my follow-up question, which was thus deleted.
Thanks to all of you for your answers.

 

You found an answer to a question that maybe nobody else knew the answer for and you deleted it. These boards are here for people to help and learn. We can't learn if you ask a question and then find the answer and delete it and don't post it.

 

I deleted the question because it was really stupid.
The question was 'Does my motherboard support UDIMM?' or words to that effect.
Then I found that 'U' stands for 'unbuffered', which is already mentioned in the user guide.

 

https://farm9.staticflickr.com/8864/17705008949_154c32aa1a_o.jpg
I just bought the above RAM, whose voltage is 1.65v, as shown in the photo above.
But Speccy says its voltage is 1.5v, as shown in the screenshot below.
https://farm6.staticflickr.com/5337/17888247532_823c2aeb9b_o.jpg
Why is there a discrepancy? Which one is correct? My motherboard user guide says that 'According to Intel CPU spec, DIMM voltage below 1.65V is recommended to protect the CPU.'

Ironically, some RAMs on the recommended list have a voltage of 1.65V, as shown in the file below.
http://dlcdnet.asus.com/pub/ASUS/mb...306.pdf?_ga=1.125103241.2020031407.1429879473
But the one I bought is not on the above list, which includes no products of OCZ.

I have just broken the rule, for a cheap price. Fortunately the mixed combination works.

 

You broke the rule and it may work but for how long. My experience has been that when you least expect it - mixed RAM will cause problems.
That was at least 10 years ago and once bitten - twice shy. Neil.

 

Not all ram can be tested with every motherboard by manufacturers the lists are usually just the most prevalent ram on the market but is usually a good mix of ram manufactures

 

Can anyone answer the question about the discrepancy in voltage mentioned in my post#26 above?

 

Do both sticks of RAM installed have the same voltage.

 

Their voltages shown by Speccy are the same, i.e. 1.5V.
Their voltages shown by BIOS are also the same, i.e. 1.5V.

But according to my RAMs' labels and online specifications, they should be different, i.e. 1.5V (Unifosa) and 1.65V (OCZ).
http://www.memory4less.com/m4l_itemdetail.aspx?itemid=1475132273 (Unifosa 1.5V)
http://uk.hardware.info/productinfo/99053/ocz-gold-2gb-ddr3-1333-cl9-kit/specifications (OCZ 1.65V)
The voltages shown there are the same as those shown on my RAMs' labels.

Is it possible that the BIOS has made them the same?

 

That is just the advertised voltage - the maximum voltage that can be applied. That is NOT the voltage it will run at. That is set by the BIOS.

What you need to worry about is making sure the RAM you get has the same specs as RAM listed on your motherboard's QVL - which can be found on your motherboard's webpage.

 

http://www.tomshardware.com/forum/291857-30-tomshardware
After reading the above, I think that my BIOS has reduced the RAM voltage to 1.5V because 1.5V is already sufficient for 1333MHz. Am I right or wrong?