m860tu support for more than 4gb ram

^ True, though there's not much of a price difference between 1066 and 1333mhz SODIMMS.

 

Yes, it's my understanding that 1333Mhz ram will downclock itself to 1066Mhz in the M860TU. You shouldn't have any problems. (Someone can correct me if I am wrong).

 

Yup, it will downclock itself until you get RAM latency that divides as a whole number into the FSB frequency. So FSB frequency on the 860/570TU is 1066, which at two cycles (two is the rule for the FSB) gives 533. 1066 RAM at 4 cycles (that is the rule for RAM) is 256 which goes nicely into 533 (= 2), assuming dual channel. If you go for 1333, you do not get an matched frequency as 533 divided by 333 (1333/4) is not a whole number so it will downclock back to 2 again.

However if SODIMMs appear at 1600, that will be a whole new story 1600 divided by 533 is 3, so it should give you a performance bost, but you may need to get newer BIOS, haven't checked that because I thought it would be a year before we get 1600 (or rather affordable 1600). Service manual (for 570TU at least) seems to suggest 1066 is the limit.

 

@varadero

so which one will I use, the 1333 or 1066? Take note I have 2x2GB for both, I have them on hand right now, so don't worry about the cost because I got the 1333 for free.

 

At the moment the maximum clock signal from the system board is 1066 megahertz, so both will work but you'll be completely wasting your money on the 1333 - it will just be downclocked to fit into two FSB cycles (ie 1066).

BTW I also heard someone on these forums having trouble getting certain brands of memory to work irrespective of frequency - I think Neil from Kobalt went for Crucial because it was the least trouble, maybe worth going by that?

 

Currently, I have the Crucial 1066 2x2GB, and the other one is Samsung 1333 2x2GB. So would it be better to just sell the 1333 MHz? Should I not save it for future use? That is, if ever Clevo releases a BIOS update that will support 1333MHz. The 1333 RAM came from PCMW which sells the M860TU with 1333 RAM.

 

Someone on the forums also mentioned that even though the 1333 will downclock to 1066, it's timing will be slightly better than the 1066 but not too noticeable, is that true?

 

While faster/better ram can have better timings at lower speeds that slower native ram, in this case, after looking at the specs of both modules, the 1333MHz ram (normally cas 8) will downclock to 1066 cas 7, which is exactly what the 1066MHz ram runs at anyway, so there will be no advantage in this instance, unless you plan on overclocking.

 

ahh.. but is cas 8 better than cas 7?

 

Less is better.

 

ahh. will the 1333mhz be cas7 when it is downclocked?

 

yes, the 1066 MHz ram runs at cas 7
the 1333 MHz ram runs at EITHER 1333MHz cas8, OR 1066MHz cas7.

So you will see absolutely no difference between the 2.

 

Ok, I've used CPU-Z and recorder screenshots of the 1066 and 1333 RAMs. Here are the pics for the 1066:







And for the 1333:







Why do they appear to be different in terms of timing?
Also, in their timing tables why doesn't the 1333 RAM have a 533 MHz column like the 1066 RAM does?

 

OK, that is very strange. Have you tried cpuz 1.50?

Otherwise, try pcwizard08 or everest and see if they give you the same readings.

 

Yes I just tried cpu-z 1.50 and it gave me the same readings. What is weird in particular?

 

pcwizard gave me the same readings. But the memory tab of cpu-z gives me the same values right?

 

The spd values for the 1333MHz ram are not stock speeds, and it's not running at the cas latencies specified in its documentation

 

Oh no, what could be the problem? When you say documentation, is that the pdf file in the samsung website? I've tried every program you've mentioned and they give the same spd values for the 1333MHz RAM.

 

I don't know what the problem is, I suggest using the 1066MHz ram, as currently, the 1333 is running slower, and even if you get it running at stock spd values, it'll be the same speed as the 1066.

 

Alright. With the 1066MHz RAM, there is no problem with the timing values and all that right?

Will the M860TU MoBo never support 1333MHz RAM even with a BIOS update in the future?

 

I think never.....Unless a overclock.

 

what are disadvantages of overclocking rams?

 

If you want to get ram over 1066, you must overclock the FSB, so CPU PCIe PCI Frequency will raise too, which may lead to a unstable situation.

 

@theriko

ok, I tried using the 1066MHz RAM again and I observed a noticeable decrease in startup time which is really explains that this is faster.

Based on the pictures I've posted in the previous page, are the SPD values of the 1066MHz RAM normal? Why do they have a 610MHz column if they are only 1066MHz RAM? And are the CAS normal values?

 

@theriko

here is the datasheet for the 1066mhz but I don't know how to compare: http://download.micron.com/pdf/datasheets/modules/ddr3/JTF16c_256_512x64ay.pdf

I hope you can help me, thanks.

 

If Clevo decides to support 1333Mhz ram, it will most likely be in the form of a motherboard upgrade. *If* that does happen, and you decide to upgrade your motherboard, you might want to hold on to those 1333Mhz sticks. Besides, they could also serve as backup ram if your current ones fail (for whatever reason).

 

The CPU's FSB would have to be at 1333MHz as well, for the RAM to run at 1333MHz.

 

@duane16

Well, do you have any ideas on the problem regarding the unusual timings of the RAM? It's downclocked to 1066 but the latencies are still high which is not right IMO.

 

@5482741

I see that you also have a 4GB 1333MHz RAM. Can you post the memory and spd tab of your laptop using cpu-z 1.50? I have to compare it with mine. Thanks.

 

How much would 2x2GB Samsung 1333MHz RAMS cost these days? Are there any laptops that support these RAMs natively?

 

I have no idea, sorry.

I was wondering the same thing. Even the new quad cores like the Q9000 etc. have a FSB of 1066Mhz so they won't fully utilize 1333Mhz ram.

 

But you do realize this is not because 1333 is simply not equal to 1066? As I said in my earlier post, the two do not need to match to work faster. The way it works is that you divide the FSB frequency by 2 and the RAM freqency by 4 (their respective cycles) and see if that gives you a whole number. 1066 RAM and 1066 FSB does. 1333 RAM and 1066 FSB does not. 1600 RAM and 1066 FSB does, but as you say, probably won't work better either, because Clevo has just decided it should be that way on their setup, in their wisdom .

 

I stand corrected.

Duane

 

Can anyone please post their CPUZ screenshots of the memory and SPD tab of those who have 1333 MHz memory installed in their M860TU? I think this would be people who bought from PCMW and EUROCOM and other resellers who offer the 1333. Thanks!

 

The new Clevo with the i7 will support 1333MHz. 12GB of it in fact.

 

When I get time I need to look at the ratio's supported by the chipset, however only a 1:2 ratio is currently used..

So my fast 1333Mhz memory is running at 10666Mhz. They are running at tight timings of 8-8-8-20.
The question is if 10666Mhz memory is available capable of running the same timing??

Either way I'm still extremely happy with the performance!!

 

Thanks for the pic EDGEEnthusiast!