Is CAS-CL-9 Better Than CAS-CL-11

[welner]

From ebay, the first 3 are CAS-CL11, the last one is CAS-CL9 and has an alum heat spreader. How much better is the CL9-RAM compared to the other 3, CL11-RAM ... Do the 1st 3 RAM's listed here also have a heat spreader ...

1) CAS-CL11: Crucial, 16GB-Kit, 2 x 8GB, DDR3, 1600mhz, PC3-12800, Non ECC, Desktop RAM, CL11-800mhz, SDRAM, $65.00

2) CAS-CL11: CMS-brand, 16GB-RAM: 2 x 8GB, 1600mhz, 240pin, DIMM, DDR3, 12800, CL11-800mhz, $68.00

3) CAS-CL11: Is this brand Blazing Memory ok at $51.35, 16GB, 2 x 8GB, DDR3, 1600mhz, PC3-12800, Desktop RAM, Non ECC, CL11-800mhz, 1600 Low Density http://www.ebay.com/itm/16GB-2x-8GB-DDR3-1600MHz-PC3-12800-DESKTOP-Memory-RAM-Non-ECC-1600-Low-Density/251438560086?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20131003132420%26meid%3Dc61ac5e457994bf28e9d1c9a230c6170%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D331079869739

4) CAS-CL9: New Crucial Ballistix Sport 16GB Kit, 1600mhz, PC3-12800
Dual Channel Kit 2 x 8GB for Desktops $62.95 http://www.ebay.com/itm/Crucial-Ballistix-Sport-16GB-Kit-8GB-x2-DDR3-1600-MHz-PC3-12800-CL9-1-5V-Memory-/281170528487?hash=item417711c8e7:g:kPcAAOxy9MpSOh8n

Crucial Ballistix Sport 16GB RAM kit, 2 x 8GB DDR3 mods, speeds up to 1600 MT/s, CL9 latency, with extended timings, 9-9-9-24. Performance, non-ECC, UDIMM, 240 pins. The new CBS Series is designed for mainstream users and enthusiasts. A simple, slick heat spreader delivers thermal perf along with stand-timings and voltages, making this reliable, quality module ideal for max-stability and compatibility. With industry-stand-specs, Alum heat spreader, little or no BIOS config required, trusted brand, anti-static-pkg.

 

[InvalidError]

Given the same clock frequency, CL9 is about 30% faster at accessing open memory rows (first word latency) than CL11 memory. This benefits non-linear memory loads such as emulation and compilation the most.

 

[welner]

For around the same price I can get the CAS-CL9 version of the same RAM for my PC, Dell 9010 i7-3770. In what kinds of PC-use, situations, would the increase in performance by the CL9-version be noticed, and are there any drawbacks to using a CL9-version compared to a CL11-version of the same type RAM.

Of these two listed above what would you recommend for the Dell 9010 i7-3770:

1) CAS-CL11: New Crucial, 16GB-Kit, 2x 8GB, DDR3, 1600mhz, PC3-12800, Non ECC, Desktop RAM, CL11-800mhz, SDRAM, $65.00.

2) CAS-CL9: New Crucial Ballistix Sport 16GB Kit, 1600mhz, PC3-12800,
Dual Channel Kit, 2 x 8GB, for Desktops, $62.95.

If the CL9 version is better than the CL11 version, why are they both around the same price ...

 

[InvalidError]

I already gave examples of applications where lower latency makes a significant difference.

There are no drawbacks to having same-frequency memory with lower latency. If you are adding memory to an existing system though, there may be compatibility issues between your CPU and mixed DIMMs. Mixed DIMMs will work most of the time but keep in mind that the maximum speed / fastest timings will be dictated by the slowest DIMM.

 

[Tradesman1]

What's currently in the HP? It may not have support in the BIOS for CL9 sticks in which case they would run at CL11 anyway - HP prebuilts typically have a locked BIOS

 

[welner]

"What's currently in the HP? It may not have support in the BIOS for CL9 sticks in which case they would run at CL11 anyway - HP prebuilts typically have a locked BIOS."

It's a Dell 9010 i7-3770 with a Dell 0KV62T mobo. Where should I look in the BIOS to see if it will be able to utilize CL9-RAM ...

 

[welner]

"If you are adding memory to an existing system though, there may be compatibility issues between your CPU and mixed DIMMs."

I will not be mixing DIMM's ... Is the CL9 version compatible with the Dell 9010 i7-3770 with a Dell 0KV62T mobo. Where should I look in the BIOS to see if it will be able to utilize CL9-RAM ...

 

[welner]

For around the same price I can get the CAS-CL9 version of the same RAM for my PC, Dell 9010 i7-3770.

1) In what kinds of PC-use, situations, would the increase in performance by the CL9-version be noticed.

2) Will the difference be noticed when using 1 or more open browsers with lots of open tabs on the internet, running many programs, and doing searches in windows explorer. Seperately or some or all at the same time.

3) Are there any drawbacks to using a CL9-version compared to a CL11-version of the same type RAM. Is more power used to run at idle or when in use ...

4) Of these two what would you recommend for the Dell 9010 i7-3770 being used for the above listed purposes:

1) CAS-CL11: New Crucial, 16GB-Kit, 2x 8GB, DDR3, 1600mhz, PC3-12800, Non ECC, Desktop RAM, CL11-800mhz, SDRAM, $65.00.

2) CAS-CL9: New Crucial Ballistix Sport 16GB Kit, 1600mhz, PC3-12800,
Dual Channel Kit, 2 x 8GB, for Desktops, $62.95.

Crucial Ballistix Sport 16GB RAM kit, 2 x 8GB DDR3 mods, speeds up to 1600 MT/s, CL9 latency, with extended timings, 9-9-9-24. Performance, non-ECC, UDIMM, 240 pins. The new CBS Series is designed for mainstream users and enthusiasts.

A simple, slick Alum Heat Spreader delivers thermal performance along with stand-timings and voltages, making this reliable, quality module ideal for max-stability and compatibility. With industry-stand-specs, little or no BIOS config required, trusted brand, anti-static-pkg.

5) Does the 1) Crucial RAM listed above with the C11 also have an aluminum heat spreader.

6) If the CL9 version is better than the CL11 version, why are they both around the same price.

 

[InvalidError]

For the third time, CL9 will only make a very noticeable difference in heavy workloads that are particularly sensitive to memory latency unless your motherboard's BIOS has a bug or whitelist that prevents it from working with random off-the-shelf DIMMs. You won't notice any difference for mundane things like web browsing and general computer usage that are mainly IO-bound.

Since the CL9 RAM is cheaper, it makes no sense to bother with the slower same-frequency CL11 RAM.

There is next to no manufacturing cost difference between CL9 and CL11 1600MT/s RAM. The slower CL11 RAM is more expensive simply due to availability - nobody should want it, so nobody is stocking it for distribution and sale, and it gets more expensive as a result. The DRAM manufacturers' yields on CL9/10 are likely also good enough that hardly any dies are bad enough to genuinely land in the CL11 bin.

 

[welner]

I'll be buying the CL9 version RAM ...

1) Why on the Crucial Dell 9010 compatibility page are there 15 choices and they are all CL11 or CL13, none of them are under CL11 http://www.crucial.com/usa/en/compatible-upgrade-for/Dell/optiplex-9010-%28desktop%29

 

[InvalidError]

Qualified lists are only a small subset of all possibilities. If Dell hard-coded their BIOS to only support CL11 or higher/worse, then Corsair and other DIMM manufacturers won't waste their time qualifying DIMMs faster than the PC OEM's BIOS can support.

CL9 should still work fine on a board hard-coded for CL11-13, it'll simply run at the slower CL11 timing. If you really don't want to take any chance with the DIMMs possibly not working in your PC, pick something that has been officially qualified.

I have a 4x8GB DDR3 setup on my motherboard and the DIMMs I used aren't on the QVL at all. Their SPD says they are 1333-10 but they work fine at 1600-9. Mileage may vary.

 

[welner]

Is the min CL designation listed in the BIOS or under Start/System or on the Dell 0KV62T mobo specs page ...