DDR2 800 RAM with CAS 4 Latency?

Is there any DDR2 800 PC2-6400 200 PIN SO-DIMM Laptop Memory that has CAS 4 Latency? The fastest I can see is CAS 5.

 

I don't think there is even a laptop out at the moment that can run 800MHz DDR2 @ 800MHz (I don't know if the newest Puma based AMD laptops do or not). You are better off getting DDR2 667 CAS 4.

-J.B.

 

New Laptops with Montevina CPU can run DDR2 800.

 

Follow this link and click the RAM dropdown. DDR2 800Mhz CL4. I don't know where to buy but it does exist that is my point.

 

So, if you put this in a notebook only running 667 RAM it would downclock itself to 667. Would it also drop to CAS 3?

The 667 RAM i have now drops a clock as soon as it hits the next lowest mHz cycle...would it hold true for this?

 

Good question. Depends on the RAM (the SPD table within the RAMs specify the CAS values at different speeds).

I am using a laptop that supports DDR2-533MHz. I have purchased a PQI 1GB DDR2-800 and its SPD ratings were CAS5 @800MHz, CAS4 @667MHz and CAS3 @533MHz so my laptop started to run at CAS3. Later I purchased the 2GB version of PQI DDR2-800. I was unlucky this time since its SPD ratings were CAS5 @800MHz, CAS4 @667MHz and CAS4 @533MHz. I had to sell it back...

 

I do remember PP mentioning (sometime back) that the Kite Refresh Platform supports and runs DDR2 memory at 400MHz..!!

 

^^+ and that is before Puma, AMD has supported for a while now. I didn't think anyone was listening? Maybe I will now be less obnoxious as clearly people are paying attention.



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Thanks for the link but I think that one is referring to Kingston HyperX 240-pin RAM. http://www.valueram.com/datasheets/KHX6400D2LLK2_4G.pdf . My notebook needs 200-pin RAM.

 

I think the HyperX 200-pin CL4, is available as OEM at the moment and may come out as retail in a few months....
Check out this link, it shows the Coming Soon models and the model nos. KHX6400S2 ULK2/2G, etc - might be referring to ULTRA-LOW LATENCY....

I guess corsair also might bring out notebook dominators or platimum pro's and stuff like that..

I would say, search on ebay -- maybe it will be available as OEM in the Far East..!!

 

I didn't research but one way to retain knowledge is to discriminate. By that I mean know what is important and what is not. Well I am not even going to bother to research or double check. The important information I need to know is it is a mobile platform, it uses the P CPU's. It is 200pin SODIMM. Do not doubt me!

 

EDIT: see my next post to clear confusion.

 

are you kidding, its much less than 5% in actuality.
If you have two identically spec'ed systems, one with 2gb of ddr pc2100 and one wiith 2gb of ddr3 2000 and you ran both systems with the same tasks, you would notice zero speed difference. The bandwidth of the memory is pretty useless as the other components cannot even make use of a fraction of the speed of the memory. You will only see a different performance value in synthetic benchmarks. In real life you would notice no difference.

K-TRON

 

Wow? Did you read your links? I did. Let us start with link #1. They compare different speed RAM I might add all DDR so not recent. the lower latency with lower speed do well against the higher speed higher latency. So how you come to your conclusion on this in this discussion is beyond me.

The second well too much common sense, to put it simple if I double the RAM speed but also double the latency I will in fact achieve little to nothing? Yea? Makes sense to me.

Your links were about increasing speed and latency? This thread is about 800MHz with lower CL and while your links did not discuss this. They did make clear CL is important. CL can have as much affect on overall performance as speed. You really missed that. Reread and post back.

Your conclusions are flawed, it is likely that 800Mhz CL4 might out perform 1066Mhz CL7

 

You're right, I didn't really look at the 1st link, it was just one of the 1st links up under google. Edited other post to change this.

Right, I agree.

I will agree, the TH link doesn't say anything about 800MHz RAM at 5 vs 4 timings, however the principles still apply. I just picked out a result now, the Aeneon and GSkill, the speeds (rated) are the same though the Aeneon has tighter timings. The difference is minimal (again, just carry the principle, ~2-3% difference for going from 5 to 4 timings).

That is right, it should since the ratio of speed to latency is better for the 1st module.

I said I was being generous, I just wanted a nice "round" number.