CAS Latency compatablility? Frequency???

rookienoob · 10-27-2009, 03:50 PM

Hi guys 'n gals

I came across a cheap set of ram memory (2*1gb)
(theese http://www.patriotmemory.org/product...&id=670&type=1 )
I understand, they have a low CAS latency (7-7-7-18) - What does this mean and does it limit their compatability?

Patriot's site says, they supports Core2Extreme...

But will theese work in an AM3 MB like this http://www.asus.com/product.aspx?P_ID=fcsXWSxnhzZE9rnR ?
If yes, will the lower latency make them perform better in this environment, than ordinary 9-9-9-24?

Also, these are 1600MHz - is that better than 1333, and why?

Thank you geniuses :D
-Rooknab

**Tyree** · 10-27-2009, 04:13 PM

Those Latencies are about par for DDR3.
It "should" work with that Mobo but note the (O.C.) listed with 1600.
4 x DIMM, Max. 16 GB, DDR3 1800(O.C.)*/ 1600(O.C.)/1333/1066/800
Personally, I would go with 1333.

rookienoob · 10-28-2009, 03:00 AM

Well I plan on putting them in a case with two fans for airflow and a huge heatpipe cpu-cooler (more airflow).

I have no experience with OC whatsoever, so I don't know exactly what influence it will have in this context (I'll make a thread on that in the OC section).

Thank you.

But I still want to know what difference the CAS latency means, and if I have to use the same kind of ram, the next time I upgrade...

**greenbrucelee** · 10-28-2009, 04:08 AM

latency means how fast the ram works at so cl 7 is better than cl 9 or in timmings if it says 5-5-5-15 or 4-4-4-12 the 4-4-4-12 is better because it's faster

**greenbrucelee** · 10-28-2009, 04:15 AM

to know wether ram is compatible for your board you have to check on your board manufacturers website. Some ram selling companies have a configurator on their sites to get you the right ram.

you can't just put any old ram in a pc.

Cobracon · 10-29-2009, 01:03 PM

http://en.wikipedia.org/wiki/CAS_latency

http://www.memorysuppliers.com/caslatwhatis1.html

http://www.tech-faq.com/cas-latency.shtml

http://e-articles.info/e/a/title/What-is-CAS-latency/

rookienoob · 10-31-2009, 07:23 AM

Thank you Cobracon :)

I think I understand now

I'm done here (Admins can close this thread)

10-27-2009, 03:50 PM	#1 (permalink)
rookienoob Registered User Join Date: Oct 2009 Posts: 61 OS: xp sp2	CAS Latency compatablility? Frequency??? Hi guys 'n gals I came across a cheap set of ram memory (21gb) (theese http://www.patriotmemory.org/product...&id=670&type=1 ) I understand, they have a low CAS latency (7-7-7-18) - What does this mean and does it limit their compatability? Patriot's site says, they supports Core2Extreme... But will theese work in an AM3 MB like this http://www.asus.com/product.aspx?P_ID=fcsXWSxnhzZE9rnR ? If yes, will the lower latency make them perform better in this environment, than ordinary 9-9-9-24? Also, these are 1600MHz - is that better than 1333, and why? Thank you geniuses :D -Rooknab Last edited by rookienoob; 10-27-2009 at 03:51 PM.*

10-27-2009, 04:13 PM	#2 (permalink)
Tyree Mentor Hardware Team Join Date: May 2009 Location: Illinois Posts: 5,846 OS: XP Pro-7RC-Mandriva My System	Re: CAS Latency compatablility? Frequency??? Those Latencies are about par for DDR3. It "should" work with that Mobo but note the (O.C.) listed with 1600. 4 x DIMM, Max. 16 GB, DDR3 1800(O.C.)*/ 1600(O.C.)/1333/1066/800 Personally, I would go with 1333. __________________ Posting your PC specs will help us to help you quicker and more efficiently.

10-28-2009, 03:00 AM	#3 (permalink)
rookienoob Registered User Join Date: Oct 2009 Posts: 61 OS: xp sp2	Re: CAS Latency compatablility? Frequency??? Well I plan on putting them in a case with two fans for airflow and a huge heatpipe cpu-cooler (more airflow). I have no experience with OC whatsoever, so I don't know exactly what influence it will have in this context (I'll make a thread on that in the OC section). Thank you. But I still want to know what difference the CAS latency means, and if I have to use the same kind of ram, the next time I upgrade...

10-28-2009, 04:08 AM	#4 (permalink)
greenbrucelee Mentor Hardware team Join Date: Apr 2007 Posts: 1,932 OS: XP SP3 My System	Re: CAS Latency compatablility? Frequency??? latency means how fast the ram works at so cl 7 is better than cl 9 or in timmings if it says 5-5-5-15 or 4-4-4-12 the 4-4-4-12 is better because it's faster __________________ Microsoft certified professional, Network +, A+ certified Last edited by greenbrucelee; 10-28-2009 at 04:11 AM.

10-28-2009, 04:15 AM	#5 (permalink)
greenbrucelee Mentor Hardware team Join Date: Apr 2007 Posts: 1,932 OS: XP SP3 My System	Re: CAS Latency compatablility? Frequency??? to know wether ram is compatible for your board you have to check on your board manufacturers website. Some ram selling companies have a configurator on their sites to get you the right ram. you can't just put any old ram in a pc. __________________ Microsoft certified professional, Network +, A+ certified

10-29-2009, 01:03 PM	#6 (permalink)
Cobracon Registered User Join Date: May 2008 Location: Roosterpoot, MS; US of A Posts: 63 OS: XP Pro SP3 & Win 7 RC My System	Re: CAS Latency compatablility? Frequency??? http://en.wikipedia.org/wiki/CAS_latency http://www.memorysuppliers.com/caslatwhatis1.html http://www.tech-faq.com/cas-latency.shtml http://e-articles.info/e/a/title/What-is-CAS-latency/ __________________ *Have you scanned the RAM timings for Operator's Headspace?? Too much real estate between the audio collectors will prevent proper operation of your computer.......B.Lowe*

10-31-2009, 07:23 AM	#7 (permalink)
rookienoob Registered User Join Date: Oct 2009 Posts: 61 OS: xp sp2	Re: CAS Latency compatablility? Frequency??? Thank you Cobracon :) I think I understand now I'm done here (Admins can close this thread)