Sandy Bridge's Native Memory Speed?

[OnePostWonder]

I would like for someone to enlighten me as to what the native memory speed for Sandy Bridge is.

What sparked my interest in this was an article over at Fudzilla describing Ivy Bridge's native DDR3 1600mhz support.

Perhaps it would be best if someone first explained to me how "native memory speed" is decided.

When I look at a motherboard such as Asus' P8P67-Pro, it lists memory support as DDR3 2200(O.C.)*/2133(O.C.)/1866(O.C.)/1600/1333/1066. From what I've been able to find and read, speeds without (O.C.) next to them indicate native support.

Though Intel's own charts show a processor such as the i7 2600k with DDR3 1333mhz support.

Am I misguided?

 

[cdawall]

1333mhz is jedec's max DDR3 speed.

 

[OnePostWonder]

I had something written here, then I thought some more.

 

[cdawall]

I had totally forgotten about profiles.

So when referring to "native", it may be used synonymously with JEDEC?

yes AMD technically is 1333 as well but advertise 1600mhz which i thought intel did as well

 

[OnePostWonder]

http://en.wikipedia.org/wiki/DDR3_SDRAM#Modules

So when referring to "max DDR3 speed", which column are you referring to?

 

[cdawall]

http://en.wikipedia.org/wiki/DDR3_SDRAM#Modules

So when referring to "max DDR3 speed", which column are you referring to?

so i was incorrect JEDEC's maximum speed is 1600mhz for DDR3

The JESD79-3 document defines DDR3L SDRAM, including features, functionalities, AC and DC characteristics, packages, and ball/signal assignments with the exception of what is stated within this standard. The purpose of this standard is to define the DDR3L specifications that supersede the DDR3 specifications as defined in JESD79-3. The use of DDR3-800, DDR3-1066, DDR3-1333, and DDR3-1600 titles in JESD79-3 are to be interpreted as DDR3L-800, DDR3L-1066, DDR3L-1333, and DDR3L-1600, respectively, when applying towards DDR3L definition; unless specifically stated otherwise.

http://www.jedec.org/standards-documents/docs/jesd79-3-1

 

[OnePostWonder]

I still don't understand why Asus acts as if DDR3 1600 is native on Sandy Bridge, yet Intel's charts state otherwise.

I may just be entirely confused.

Unrelated: Do you play Bad Company 2, cdawall? I feel like I've seen your name somewhere and BC2 seems to be the right context.

 

[Mussels]

the native memory support is what they're guaranteed to work with, inside JEDEC standards.

 

[cdawall]

I still don't understand why Asus acts as if DDR3 1600 is native on Sandy Bridge, yet Intel's charts state otherwise.

I may just be entirely confused.

Unrelated: Do you play Bad Company 2, cdawall? I feel like I've seen your name somewhere and BC2 seems to be the right context.

nah only games i have been on are GT5 and crysis

and intel is a bunch of goobers they only list the i7 965EE as a 800/1066

http://ark.intel.com/Product.aspx?id=37149

 

[cadaveca]

All 1366 i7's have the same "limit". P55 is 1066/1333. Been that way for many years now...



Mean that if you run XMP...no warranty...anything higher than those specs...guess what, no warranty.

Something to keep in mind when you gotta rma...

P67 is P55 equivalent, so the same memory speeds still apply. SKT 2011...remains to be seen.


Also, JEDEC also has 1833/2133 spec too, for the up and coming BullDozer(maybe SKT 2011?). Hence all the new 1.5v DIMMs.

 

[cdawall]

All 1366 i7's have the same "limit". P55 is 1066/1333. Been that way for many years now...



Mean that if you run XMP...no warranty...anything higher than those specs...guess what, no warranty.

Something to keep in mind when you gotta rma...

you can return a product to gskill for not performing at rated speeds. like my tridents XMP to 2000CL9 on P55 other than that chipset if they wont clock to 2000 then its your bad for buying the wrong ram. worked perfect on my H55 but i knocked them back to 1600 6-9-6 1.55v

 

[OnePostWonder]

the native memory support is what they're guaranteed to work with, inside JEDEC standards.

"They're" being the CPUs? If so, are you therefore stating that the i7 2600k is not guaranteed to work with DDR3 1600mhz memory?

Also, I read your reply with a big grin on my face...because I looked at the seal first.

What follows is an attempt at a double quote:

and intel is a bunch of goobers they only list the i7 965EE as a 800/1066

I lawled and flashed back to a Chemistry room in HS when a Chem teacher, appropriately deemed Mr. Waddlesworth, called a student a goober and lost.

 

[cadaveca]

you can return a product to gskill for not performing at rated speeds. like my tridents XMP to 2000CL9 on P55 other than that chipset if they wont clock to 2000 then its your bad for buying the wrong ram. worked perfect on my H55 but i knocked them back to 1600 6-9-6 1.55v

I'm afraid you lost me? I thought we were talking about CPU's?

 

[cdawall]

I'm afraid you lost me? I thought we were talking about CPU's?

i thought we were talking about both my mistake

 

[cadaveca]

i thought we were talking about both my mistake

Apology accepted. Moving along...

 

[Mussels]

the memory controllers are in the CPU's.


more or less, its what they gurantee to work.

if they say 1600Mhz supported, you can RMA if 1600MHz at JEDEC standard timings and voltages doesnt work.

If you try 1800Mhz they can say "tough luck, not supported"

 

[OnePostWonder]

I still am quite confused.

Cadaveca, you say that the P67 is the P55 equivalent, therefore the same memory speeds still apply.

Yet from what I gathered from the article at Fudzilla, Intel's 7 series chipset will move up to DDR3 1600 being supported natively, so the idea that the memory speeds are given based on the market segment doesn't fit. Perhaps I was misreading you, but I'm sure this is what you were implying.

All 1366 i7's have the same "limit". P55 is 1066/1333.

You confused me here too, as you went from socket and brand to a chipset that isn't related to either.

 

[OnePostWonder]

the memory controllers are in the CPU's.


more or less, its what they guarantee to work.

if they say 1600Mhz supported, you can RMA if 1600MHz at JEDEC standard timings and voltages doesn't work.

If you try 1800Mhz they can say "tough luck, not supported"

Now it is making sense. Do you find it odd then, Mussels, that Asus lists DDR3 1600 on Sandy Bridge without the (O.C.) next to it?

Or does that indicate that DDR3 1600 is now within JEDEC standard, even though it isn't "supported" by the CPU?

 

[cadaveca]

I still am quite confused.

Cadaveca, you say that the P67 is the P55 equivalent, therefore the same memory speeds still apply.

Yes, explanation in a moment.

Yet from what I gathered from the article at Fudzilla, Intel's 7 series chipset will move up to DDR3 1600 being supported natively, so the idea that the memory speeds are given based on the market segment doesn't fit. Perhaps I was misreading you, but I'm sure this is what you were implying.

I try to not imply anything.

You confused me here too, as you went from socket and brand to a chipset that isn't related to either.

Yeah, you bet i did. SKT1366 is i7(x58), but SKT1156(P55) is i7/i5/i3....and then, SKT1155(P67) is i7/i5/i3 as well. Even more confused? It only gets better.

But seemingly, you got it all right there anyway, so although it may be confusing, I think you catch my drift.

Now it is making sense. Do you find it odd then, Mussels, that Asus lists DDR3 1600 on Sandy Bridge without the (O.C.) next to it?

Or does that indicate that DDR3 1600 is now within JEDEC standard, even though it isn't "supported" by the CPU?

No, what ASUS is trying to guarantee is that the board( they mean bios) will support 1600mzh ram. They'd be lying in some situations. But, Mussels is right, if the board doesn't work, or a differnt bios on the same board doesn't work, then they will accept an RMA based on those conditions. But he means the board makers, not Intel.


The question reamins, how do they certify that 1600mhz speed, without a cpu that supports it?

 

[Mussels]

Now it is making sense. Do you find it odd then, Mussels, that Asus lists DDR3 1600 on Sandy Bridge without the (O.C.) next to it?

Or does that indicate that DDR3 1600 is now within JEDEC standard, even though it isn't "supported" by the CPU?

no because asus are guaranteeing different speeds to intel.

they're saying "this BOARD can do XXXX Mhz", whereas intel are saying what the CPU is guaranteed to do.

 

[btarunr]

The i7 chips' IMC supports 12x DRAM multiplier, i5 is limited to 10x.

 

[cdawall]

no because asus are guaranteeing different speeds to intel.

they're saying "this BOARD can do XXXX Mhz", whereas intel are saying what the CPU is guaranteed to do.

best thing about asus is they can claim 1600mhz is overclocking and overclocking is never a guarantee. similar to MSI and the 790FX-GD70 which "supported" 2000mhz ram no one really ever hit 2000mhz with that mobo

 

[OnePostWonder]

ITT: Everyone is a celebrity except me

Cadaveca, I was mistaken about the P55 chipset. In my mind I had jumped back one more generation, so I see where I made my mistake.

I believe I understand now, Mussels.

Is it a correct statement then to say that you may buy a board like the P8P67-Pro, buy memory rated at 1600mhz and not have to OC, and buy a processor like the i7 2600k which natively supports 1333mhz memory, and the memory will still run at 1600mhz?

 

[cdawall]

ITT: Everyone is a celebrity except me

Cadaveca, I was mistaken about the P55 chipset. In my mind I had jumped back one more generation, so I see where I made my mistake.

I believe I understand now, Mussels.

Is it a correct statement then to say that you may buy a board like the P8P67-Pro, buy memory rated at 1600mhz and not have to OC, and buy a processor like the i7 2600k which natively supports 1333mhz memory, and the memory will still run at 1600mhz?

core i3 560 had no issues using the XMP profile for 2000mhz just one click and it was good to go same should go for your p8p67 good luck getting one after the B2 fiasco

 

[cadaveca]

Is it a correct statement then to say that you may buy a board like the P8P67-Pro, buy memory rated at 1600mhz and not have to OC, and buy a processor like the i7 2600k which natively supports 1333mhz memory, and the memory will still run at 1600mhz?

technically, yes. People will tell you 4x 2gb sticks @ 2133 is hard too, but you know, what, I don't listen :