What is better :DDR2-1066Mhz or DDR3-1066Mhz or DDR2-800/DDR3-800

Hi guys what do you thing is there big difference?
any suggestion ?

 

ddr2/ddr3

no real difference in speed

 

Go with the DDR2 for now, if it's an option. It's much less expensive, and isn't any slower than DDR3. It'll be a lot cheaper to upgrade in the future if you go that route, too.

 

DDR2-1066 would be the fastest - highest clock speed and lower latency than DDR3-1066. But really the difference is going to be negligible for all of them.

 

This thread from last year tried to put some numbers on the performance.

Eventually DDR3 should take over as both latency and prices drop but, at the moment, the chipset is the bottleneck.

John

 

DDR2 1066 is usually a bit faster than DDR3 1066 because of the huge timing difference.

 

What is better in timing , when numbers are lower or higher ?
for example I have :
Memory Timings
CAS Latency (CL) 6T
RAS To CAS Delay (tRCD) 6T
RAS Precharge (tRP) 6T
RAS Active Time (tRAS) 18T
Row Refresh Cycle Time (tRFC) 51T
RAS To RAS Delay (tRRD) 3T
Read To Precharge Delay (tRTP) 5T
Four Activate Window Delay (tFAW) 15T
Write CAS Latency (tWCL) 5T
Refresh Period (tREF) 7.8 us

 

The lower the timing the better the memory performs.

 

I wouldn't mess around with those numbers if you don't know what you are doing. It will easily lead to memory instability at no performance benefit. If you want to read more, I believe TechARP describes all the functions in the BIOS in their BIOS optimization guide (this would be under the memory section).

 

I don't think he's looking to change his timings, just researching what he should buy.

 

He mentioned that those numbers were what he had already. Besides, most products don't give that much detail in their specs. Either way, the BIOS optimization guide will give you a brief description of what each of those numbers mean.

 

Timings are expressed in terms of clock cycles.

5 clock cycles at 800MHz, 4 at 667MHz and 3 at 533MHz are the same physical time. However, once the delay needed to access the right part of the memory is out of the way, data will flow fastest at the highest frequency (subject to the ability of the chipset and the rest of the system to handle the flow of data).

John

 

http://www.tomshardware.com/reviews/tight-timings-high-clock-frequencies,1236.html
Very old article, but still applicable.

 

So if DDR2 1066MHz is faster then DDR3 1066MHz , what's the point of it being on the market ?

So they can make more money ?

 

You're right. Everyone who buys DDR3 1066 right now is wasting their money. I doubt anyone will be stupid enough to buy 1066mhz DDR3 ram though. They're like twice as expensive than 1600Mhz DDR3 ram.

When you're comparing with a top end last generation RAM with a low end current generation ram, the old ram will always perform better.
E.G. DDR 400 performs faster than DDR2 400. 200Mhz SDRAM performs better than DDR 200.

 

There's a lot of NBs now who have DDR3. Why are manufacturers using this memory then if they know that the NB will perform much better with DDR2?
Doesn't make sense.

 

If you are using DDR2, you can not upgrade to DDR3 in the future because they are different. You can not use DDR2 slot for DDR3 memory.

 

So if i changed my DDR3 to DDR2 would i see a big difference in performance ?

 

They're not compatible with each other, you can't just switch it out.
That laptop only supports DDR3.

 

DDR2 1066mhz is faster than DDR3 1066mhz. But once you get to about 1600mhz, DDR3 will be faster.

 

The Acer Aspire 8930 can come with DDR2 or DDR3 , their are two motherboards.

 

So that's with all laptops then ?

If you have DDR2 you can't go to DDR3 and vice versa ?

And the amount of MHz has to be equal or less to the FSB , right ?

 

Yes, that's with all laptops. DDR2 and DDR3 are not compatible or interchangeable in any way. Same goes for desktops.

And in regard to the FSB/memory frequency, yes usually that's the case, but you could take a chip with a 667mhz FSB and put it in your laptop with DDR3-1066, and it would work fine. It's just kind of unconventional - that would be a low end chip with high end memory and just wouldn't make much sense.

 

Thx for explaining Hep! .

One more question and probably the most important :

- how much faster is DDR2 1066MHz in comparison with DDR3 1066MHz ?

 

The difference is so negligible that you would never notice even if you were looking for it. Only benchmarks will show the difference, and even there the variance is minimal.

 

Nice move from the manufacturers then , lol

Bring out memory that virtually performs the same or even worse AND ask more money for it

 

Well, for one thing I don't know of any laptops that support DDR2-1066.
For another, DDR3 will eventually be better.

 

Same goes for desktops.
And now I can see, the manufacturers ofering DDR3 Triple Channel for desktop
And newest graphic cards using DDR5 so there must be some diff.
I think DDR2 DDR3 DDR5 the difference is about how fast is fillrate and clear out data

 

yeah OCZ producing 1333 Mhz ddr3

 

DDR2-1066 doesn't exist for laptops (SODIMM). As stated before, memory speed is mostly a marketing gimmick. The difference in DDR2-667 CL4 and DDR2-800 CL5 and DDR3-1067 CL6 is negligible. The reason why we go from DDR2 to DDR3 is that DDR2's max potential is nearing, while DDR3 still has lots of room for expansion (ie. DDR2 won't run at 1600 while there are DDR3-1600).

Triple channel is also marketing, there were benchmarks comparing double channel on a triple channel board without noticeable loss in performance. Don't get mixed up with GPU memory, however. GPUs use GDDR technology, GDDR3 is not the same as DDR3 (system memory).

 

Exactly I spend hour searching DDR2-1066 SODIMM there are nowhere ..
that's why i put even 800Mhz in title ..
Laptop Memory Types:
DDR2-667 SDRAM,
DDR2-800 SDRAM,
DDR3-667 SDRAM,
DDR3-800 SDRAM,
DDR3-1066 SDRAM

 

I just asked one guy on ebay he is called (ID) --> computerupgradekings
and he says the difference from ddr2 and 3 are that ddr2 has got 200pins and ddr3 has got 204pins
i asked him:
If I will buy 2x4GB DDR3 1066 for my
vaio aw11s/b it will not work?
he answered :
of course it won't
you can't put 204 pin ram into a socket that only fits 200 pin.
Sony Z series is the only sony model that supports 204 pin ddr3.
and this vaio series z has got GM45 chipset...

 

sgogeta4

I actually found that DDR2 1066 but for mac
http://images.google.co.uk/imgres?i...imm&hl=en&sa=N&um=1&ei=wRjuSfupII-86AOGupXxAw

 

Too bad no mobile system actually supports DDR2-1067. And yes, DDR3 and DDR2 are not physically compatible - this was the point in the last few pages.

 

A DDR2 1066mhz ram is about 5-10% faster than DDR3 1066mhz ram. Going from DDR2 533mhz CL4 to DDR2 CL5 will give you more than 25% performance boost in memory throughtput. If you have programs which take advantage of the faster RAM speed, then it would translate to 25% if not more performance gain. For normal applications such as word processing, RAM from 10 years ago would be fast enough.

Compared to DDR2 800mhz Cl4 to DDR3 1600Mhz CL7, DDR3 1600mhz Cl7 ram will perform more than 100% faster, so double the performance. Whether if you'll get 100% performance increase is heavily dependant on what programs you use.

 

So if DDR2-1066 doesn't exist how can you compare these two.

If that is true shouldn't we be only comparing ddr2-800 and ddr3-1066.

This still doesn't answer my question. There is no 1600 memory in laptops but ther is ddr3. So why do they build it like that if there is no performance gains?

 

We can compare DDR2-1066 to DDR3-1066 because they both exist for desktops.
Eventually when DDR3 latencies go down it will be much better performing memory. For now it's about equal, but that's what the new chipsets are supporting. It's not like Dell or HP or even Sager or MSI can just be like "mmmm nah let's use something else." Intel made that decision.

 

Just because you can't find DDR3 1066mhz and 1600mhz memory doesn't mean they don't exist.

14 result for DDR3 1066mhz SODIMM
http://ncix.com/search/?categoryid=0&q=ddr3+1066mhz+sodimm

DDR3 SODIMM isn't ready for market thus they're not releasing it to the public. Desktop DDR3 ram goes up to DDR3 2133.

Currently, DDR3 sodimm goes up to 1333mhz, but you can easily over clock it to 1600mhz. Unless you're an overclocker, 1600mhz DDR3 SODIMM is useless

They build it because the technology is newer, they're able to achieve faster clock speed, they use less power, and manufactures wants to make money.

 

they exist that's why I left link above ...

 

I just find out that DDR2 for mac 1066 Mhz that mistake on their website !!
I checked corsair web and I couldn't find DDR2 1066 200pim ..
They really desn't exist ! max 800

 

This is the one you're referring to. http://www.tigerdirect.ca/applications/searchtools/item-details.asp?EdpNo=4417207&SRCCODE=SHOPSHOP&cm_mmc_o=2mHCjCmtB5fBbfCjCVqHCjCdwwp

 

I REALLY don't understand why they are ONLY for Mac !

 

There's no difference between Mac memory and "PC" memory. Mac is a PC thus their parts are compatible.

 

Ok so if I'm buying a new NB and lets say that there is a model, one version with ddr2(800?) and one with ddr3(1066?) which one you sugest I should take? And lets say all other components are the same.

 

That's so that Mac owners can pay extra and feel happier. However, sometimes the "Mac" variety doesn't sell and then the price gets discounted.

John

 

The one with the DDR3.

 

Why DDR3? It's still cheaper to get the DDR2 now. DDR3 currently offers you nothing over DDR2 at more cost and the current crop of notebooks from Intel/AMD can't take advantage of the higher DDR3 frequency. I would choose the DDR2.

 

Cost difference is negligible. I'd prefer the newer platform, personally.

 

I am Going to order these : http://www.sybaritic.co.za/store/index.php?cPath=512_560
or these : http://www.tigerdirect.ca/applicati...SHOPSHOP&cm_mmc_o=2mHCjCmtB5fBbfCjCVqHCjCdwwp

 

Why? No chipset will support that, it will just downclock to PC2-6400 (DDR2-800).