Ram question .. noob question

[JayBee805]

Hello guys , as some of u know I’m pretty new to pc gaming or pc in general so I have a lot to learn , I was looking at a ram kit from Corsair ... one being cl14 3200and other 3600 c18 ... the c18 209 dollars the c14 270 isn’t the c18 supposed to b more expensive since it’s 3600 vs the 3200? 

[Crunchy Dragon]

That is pretty interesting.

 

Usually, higher speed memory is more expensive, yes.

[Firewrath9]

10 minutes ago, Crunchy Dragon said:

That is pretty interesting.

 

Usually, higher speed memory is more expensive, yes.

One is bdie, on is regular. (Prob adie or cdie)

Bdie is 2400 c11,2666c12,3000cl13/14, 3200c14,3600c16,4000c17/18,4200c18/19,4600c20-22

 

FYI, samsung B-Die is the best vram, has highest speeds and tightest timings. Its kind of like binning, but designed to perform better think lightning z, or kingpin

[MageTank]

2 minutes ago, Firewrath9 said:

One is bdie, on is regular. (Prob adie or cdie)

Bdie is 2400 c11,2666c12,3000cl13/14, 3200c14,3600c16,4000c17/18,4200c18/19,4600c20-22

 

FYI, samsung B-Die is the best vram, has highest speeds and tightest timings. Its kind of like binning, but designed to perform better think lightning z, or kingpin

This is correct. Clock speeds and primary timings won't tell you the whole story behind the pricing or performance of DIMM's. That being said, if you are not manually overclocking, and your IMC/board can handle the 3600 kit's XMP, it's definitely not a bad option. 

 

B-Die is going to continue to have a price premium due to the impact that it's high demand has on the overall supply.

[Firewrath9]

Just now, MageTank said:

This is correct. Clock speeds and primary timings won't tell you the whole story behind the pricing or performance of DIMM's. That being said, if you are not manually overclocking, and your IMC/board can handle the 3600 kit's XMP, it's definitely not a bad option. 

 

B-Die is going to continue to have a price premium due to the impact that it's high demand has on the overall supply.

Yup, imo its not really worth it unless A) you have wayy to much money

b) you need mem bandwidth for some application

 

i think its hard to get 4000+mhz (what i think you should do with bdie), unless you have a board with 1 dimm slot per channel

[MageTank]

49 minutes ago, Firewrath9 said:

Yup, imo its not really worth it unless A) you have wayy to much money

b) you need mem bandwidth for some application

 

i think its hard to get 4000+mhz (what i think you should do with bdie), unless you have a board with 1 dimm slot per channel

You can still do it with boards that have 4 DIMM slots, however it requires a binned IMC and extremely relaxed tertiary timings. By that point, you would have abandoned any performance gains you would have gotten from higher memory clock speeds, so it's not worth the trade. With DDR4, the most efficient performance numbers I was able to get, came from multi-rank DIMM's clocked at 3733mhz C14-14-14-28-2. You get the performance benefits from rank interleaving on top of overall lower latency without compromising bandwidth.

[Firewrath9]

On 4/27/2019 at 9:16 PM, MageTank said:

You can still do it with boards that have 4 DIMM slots, however it requires a binned IMC and extremely relaxed tertiary timings. By that point, you would have abandoned any performance gains you would have gotten from higher memory clock speeds, so it's not worth the trade. With DDR4, the most efficient performance numbers I was able to get, came from multi-rank DIMM's clocked at 3733mhz C14-14-14-28-2. You get the performance benefits from rank interleaving on top of overall lower latency without compromising bandwidth.

Just wondering, whats the diff between single rank and dual rank?

[MageTank]

56 minutes ago, Firewrath9 said:

Just wondering, whats the diff between single rank and dual rank?

It's difficult to quantify the exact performance benefits as it depends heavily on the application in question, but the biggest benefit to multi-rank DIMM's is Rank Interleaving. The ability to read from one rank while still writing to another. Think of it like pre-loading data. In latency sensitive tasks, you can see a pretty significant performance uplift. While I wouldn't consider it concrete, my testing of dual rank vs single rank kits with identical timings (from primary to tertiary) in AIDA64's memory tests showed about a 10% boost in raw bandwidth efficiency in favor of the dual rank kits while also having reduced latency by about 5%. 

 

AMD's Robert Hallock released a pretty detailed guide on memory performance with Ryzen that I consider to be truthful across other platforms as well: https://community.amd.com/community/gaming/blog/2017/07/14/memory-oc-showdown-frequency-vs-memory-timings

 

 

While not significant by any means, there is certainly a noticeable difference. My only gripe with their testing methodology was the absence of minimum framerates / frametime charts, which would paint a much broader picture of RAM's impact on gaming performance. 

 

 

Robert ultimately came to the conclusion that extremely tight single rank DIMM's out-perform tight dual rank DIMM's. I consider this true, depending on the quality of your board and memory controller. It's just easier in general when you remove an entire set of tertiary timings out of the equation, as you reduce a lot of stress from the IMC, allowing for much higher clock speeds and tighter timings in general.

 

@JayBee805 Sorry for hijacking your thread here.

[JayBee805]

On 4/27/2019 at 7:31 PM, MageTank said:

It's difficult to quantify the exact performance benefits as it depends heavily on the application in question, but the biggest benefit to multi-rank DIMM's is Rank Interleaving. The ability to read from one rank while still writing to another. Think of it like pre-loading data. In latency sensitive tasks, you can see a pretty significant performance uplift. While I wouldn't consider it concrete, my testing of dual rank vs single rank kits with identical timings (from primary to tertiary) in AIDA64's memory tests showed about a 10% boost in raw bandwidth efficiency in favor of the dual rank kits while also having reduced latency by about 5%. 

 

AMD's Robert Hallock released a pretty detailed guide on memory performance with Ryzen that I consider to be truthful across other platforms as well: https://community.amd.com/community/gaming/blog/2017/07/14/memory-oc-showdown-frequency-vs-memory-timings

 

 

While not significant by any means, there is certainly a noticeable difference. My only gripe with their testing methodology was the absence of minimum framerates / frametime charts, which would paint a much broader picture of RAM's impact on gaming performance. 

 

 

Robert ultimately came to the conclusion that extremely tight single rank DIMM's out-perform tight dual rank DIMM's. I consider this true, depending on the quality of your board and memory controller. It's just easier in general when you remove an entire set of tertiary timings out of the equation, as you reduce a lot of stress from the IMC, allowing for much higher clock speeds and tighter timings in general.

 

@JayBee805 Sorry for hijacking your thread here.

No worries man , I like to learn about this stuff