Ram QVL question.

[GrizzlyBear0]

so as you see there's

# of Ranks x DRAM devices

it says 

1Rx8 And 2Rx8 so does that mean i cant get 2 of the 1Rx8? it wouldn't be as good ?so i should only get one of 1Rx8 instead of 2 of [1Rx8] ? or what ? i'm just confused with the QVL

 

https://gyazo.com/26b1751520f0a3cb04261f46e6e8c14c

 

[stealth80]

What board is this for? 

[GrizzlyBear0]

1 minute ago, stealth80 said:

What board is this for? 

z370P D3 and i noticed i misread  1Rx8 i thought it means 1 ram 8gb...... totall noob here. but whats the difference between 1Rx8 and 2Rx8 ?......... what does it mean.

[stealth80]

2 minutes ago, GrizzlyBear0 said:

z370P D3 and i noticed i misread  1Rx8 i thought it means 1 ram 8gb...... totall noob here. but whats the difference between 1Rx8 and 2Rx8 ?......... what does it mean.

single and double sided

 

Intel is much less picky about ram than Ryzen - basically just buy 2 sticks of the fastest ram you can comfortably afford, 3000 - 3200mhz is the sweet spot, any more than that the gains aren't noticeable even in benchmarks (albeit not bandwidth)

[GrizzlyBear0]

Just now, stealth80 said:

single and double sided

and what's the difference?.......

[stealth80]

2 minutes ago, GrizzlyBear0 said:

and what's the difference?.......

Overview

Generally Single Rank Memory is faster than Dual Rank Memory, in laymen’s terms when a computer accesses Single Rank Memory it only has to go around the track once, where are Dual Rank it would have to go around the track twice.

Compatibility

For the most part Dual Rank Memory can be used in conjunction with Single Rank Memory, and in some cases when using a large amount of memory such as 16GB, servers motherboards actually require you to use a mix of Single and Dual Rank Memory.

Ranking

The number of ranks on any DIMM is the number of independent sets of DRAMs that can be accessed for the full data bit‐width of the DIMM ie 64 bits. The ranks cannot be accessed simultaneously as they share the same datapath. The physical layout of the DRAM chips on the DIMM itself does not necessarily relate to the number of ranks. Sometimes the layout of all DRAM on one side of the DIMM PCB versus both sides is referred to as “single‐sided” versus “double‐sided”. These terms may cause confusion as they do not necessarily relate to how the DIMMs are logically organized or accessed.

For example, on a single rank DIMM that has 64 data bits of I/O pins, there is only one set of DRAMs that are turned on to drive a read or receive a write on all 64‐bits. In most electronic systems, memory controllers are designed to access the full data bus width of the memory module at the same time.

On a64‐bit (non‐ECC) DIMM made with two ranks, there would be two sets of DRAM that could be accessed at different times. Only one of the ranks can be accessed at a time, since the DRAM data bits are tied together for two loads on the DIMM (Wired OR). Ranks are accessed through chip selects (CS). Thus for a two rank module, the two DRAMs with data bits tied together may be accessed by a CS per DRAM (e.g. CS0 goes to one DRAM chip and CS1 goes to the other). DIMMs are currently being commonly manufactured with up to four ranks per module.

Consumer DIMM vendors have recently begun to distinguish between single and dual ranked DIMMs. JEDECdecided that the terms “dual‐sided,” “double‐sided,” or “dual‐banked” were not correct when applied to registered DIMMs. (from Wikipedia)

 

Not mine haha

 

source: https://www.oempcworld.com/support/singlevsdualram.html

[GrizzlyBear0]

32 minutes ago, stealth80 said:

Overview

Generally Single Rank Memory is faster than Dual Rank Memory, in laymen’s terms when a computer accesses Single Rank Memory it only has to go around the track once, where are Dual Rank it would have to go around the track twice.

Compatibility

For the most part Dual Rank Memory can be used in conjunction with Single Rank Memory, and in some cases when using a large amount of memory such as 16GB, servers motherboards actually require you to use a mix of Single and Dual Rank Memory.

Ranking

The number of ranks on any DIMM is the number of independent sets of DRAMs that can be accessed for the full data bit‐width of the DIMM ie 64 bits. The ranks cannot be accessed simultaneously as they share the same datapath. The physical layout of the DRAM chips on the DIMM itself does not necessarily relate to the number of ranks. Sometimes the layout of all DRAM on one side of the DIMM PCB versus both sides is referred to as “single‐sided” versus “double‐sided”. These terms may cause confusion as they do not necessarily relate to how the DIMMs are logically organized or accessed.

For example, on a single rank DIMM that has 64 data bits of I/O pins, there is only one set of DRAMs that are turned on to drive a read or receive a write on all 64‐bits. In most electronic systems, memory controllers are designed to access the full data bus width of the memory module at the same time.

On a64‐bit (non‐ECC) DIMM made with two ranks, there would be two sets of DRAM that could be accessed at different times. Only one of the ranks can be accessed at a time, since the DRAM data bits are tied together for two loads on the DIMM (Wired OR). Ranks are accessed through chip selects (CS). Thus for a two rank module, the two DRAMs with data bits tied together may be accessed by a CS per DRAM (e.g. CS0 goes to one DRAM chip and CS1 goes to the other). DIMMs are currently being commonly manufactured with up to four ranks per module.

Consumer DIMM vendors have recently begun to distinguish between single and dual ranked DIMMs. JEDECdecided that the terms “dual‐sided,” “double‐sided,” or “dual‐banked” were not correct when applied to registered DIMMs. (from Wikipedia)

 

Not mine haha

 

source: https://www.oempcworld.com/support/singlevsdualram.html

quick question. one of the supported ones are CMK32GX4M4A2666C16 but it's a 4x8gb ram 4 of them

https://www.corsair.com/ww/en/Categories/Products/Memory/VENGEANCE®-LPX-32GB-(4x8GB)-DDR4-DRAM-2666MHz-C16-Memory-Kit---Black/p/CMK32GX4M4A2666C16

. what if i only get one?..... it should still be compatible with the motherboard yes? or it has to be exactly 100% like the QVL

[stealth80]

6 minutes ago, GrizzlyBear0 said:

quick question. one of the supported ones are CMK32GX4M4A2666C16 but it's a 4x8gb ram 4 of them

https://www.corsair.com/ww/en/Categories/Products/Memory/VENGEANCE®-LPX-32GB-(4x8GB)-DDR4-DRAM-2666MHz-C16-Memory-Kit---Black/p/CMK32GX4M4A2666C16

. what if i only get one?..... it should still be compatible with the motherboard yes? or it has to be exactly 100% like the QVL

Right now, basically any DDR4 from a reputable manufacturer will work on Intel Z platforms - its a tried and tested platform and I don't even think they actually QVL test on the newer chipsets tbh

 

If you can go with 2x8gb 3000mhz, if not grab 1 8gb stick now and add another later - just keep in mind your ram will run at half bandwidth using 1x 8gb stick and I'm starting to think that's causing some users "stutter" in memory heavy games like BF1 - its a theory as I see a lot of times people with issues and they say they have one stick - i cant prove it as I'm not on intel

 

https://pcpartpicker.com/products/memory/#Z=8192001,16384002&s=403000&sort=price&page=1