Best Ddr2 800?

[greekman506]

Hello. How are. So.
I have hp motherboard and q9550 cpu.
Memory; ddr2? Which is fastest?

 

[greekman506]

MERGED QUESTION
Question from greekman506 : "Best 800mhz ddr2?"

Please if u know.

 

[4745454b]

At this point "fastest" should be an afterthought. What is available to you at a good cost? I wouldn't spend any money on DDR2. If you can find some cheap then maybe. But at this point the entire system should be scrapped.

 

[BFG-9000]

That's easy, 4-4-4-12 at 1.8v. That's only 10ns latency--DDR4-3200 at the lowest Jedec 20-20-20 is some 25% slower.

Often, DDR2-1066 can run at tight timings at 800 as well, and may be easier to find. But you'd probably have to run them at the voltage they normally need at 1066. I buy those locally at US$6 per 2GB stick.

But for you on a FSB, the more important timing number is between the CPU and Northbridge Memory Controller. This can be called tRd, Common Performance Level, or Static tRead Value

 

[greekman506]

I have money.
I don't care.
I send: corsair or kingston or samsung DDR2 800mzh is fastest?
Some modell? I mean which of 3?
Timing u know?

 

[J_E_D_70]

The brand is irrelevant. It’s the speed and timings. If you are adding to what you have it needs to match the existing ram.

If you are replacing it all, go to what BFG listed.

 

[ArchitSahu]

If you have money, the most effective and logical choice would be to upgrade.

For that mobo and cpu:
PCPartPicker part list: https://pcpartpicker.com/list/mmttt6
Price breakdown by merchant: https://pcpartpicker.com/list/mmttt6/by_merchant/

Memory: G.Skill - 16GB (4 x 4GB) DDR2-800 Memory ($339.99 @ Newegg)
Total: $339.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-04-07 09:41 EDT-0400

If you can get that, it will be very beneficial.

 

[4745454b]

I'm guessing from the name and the words he's using he's not in the USA. Greece is way more likely. (I'm not a senior mod so I can't check his IP address.) But I'd bet that newegg links aren't going to help much.

That does reinforce my point. $300+ for old memory is a joke. For that price you might as well just get new memory that fits new machines.

https://www.newegg.com/Product/Product.aspx?Item=N82E16820231888

Here is some 2x8GB DDR4 for $160. Half the price. If you've got the money, upgrading the entire system is a good idea. But I wouldn't spend money like that on stuff that old.

Edit: To answer your question, as above the brand doesn't matter. Crucial, Kingston, etc is all the same. DDR2-800 with lower numbers for the timings is faster than DDR2-800. Timing is milli seconds, and the less time you spend waiting the faster things are.

 

[greekman506]

Νο no.
Guys. Max ram is 8GB. So which of 3 ram ddr2 800mzh is better? I mean 800mhz ok, and 4-4-4-4, its realy? I mean i have listen the corsair is the King of that. Its have 5-5-5-12 its good?

 

[4745454b]

I don't think I've ever seen DDR2 with timings of 4-4-4-4. 4-4-4-10 or 12 sure. 4-4-4-10 is faster than 5-5-5-12. Stick with big name brands, and buy as close to 4-4-4-8 or 4-4-4-10 as you can. Avoid any 5 timing ram and avoid any ram that needs more than 1.8V.

 

[BFG-9000]

The problem with 5-5-5 is in order to use it you'd have to raise tRd by 1 (or it will be raised automatically) vs. 4-4-4. That costs you 3ns of latency right there. At this point DDR2 is so cheap that I don't mind blasting them with 2.3v if that's what it takes to get 4-4-4. If it dies, so what?

You should be aiming for around 65ns of total latency which is better than a modern Ryzen system, despite having a FSB. The original A64 with DDR1 was around 55ns but things have only got worse since then.

As for brand, well there weren't many chipmakers and most brands will use all of them depending on which revision the stick is. For Corsair you can see the whole list of them here. The most recent chips were made by Powerchips and Elpida, which scale frequency terribly with added voltage but at least that allows you to tighten timings quite a bit.

 

[4745454b]

I mentioned getting 1.8V ram only because that's the official standard. Seeing as he has ram already, sticking to standard stuff has a better chance of matching. I've seen DDR2-800 that needs 2.1V, and if he gets that there is a chance it won't work with any 1.5-1.8V ram he has already.

Again, I can't see spending money on DDR2 period. But the OP has decided to get some, so that's what I'd do. As you've said it can be had for cheap, and I don't worry about it dying as you can just get more. But when trying to match ram it's best to stick to what's there already.

Speaking of which, what ram do you already have Greekman? Try to find ram that matches that stuff.

 

[zyh1987]

If you only have 800 mhz, I believe the most oc you can get from your q9550 is 3.4 ghz, because your multiplier is locked at 8.5. I have a q9550 and o remember I use to have these 1066 ram where it runs at 5-5-5-15 @2.1v or something. But I have many of them fail after 3 month, so I ran the at 800 @1.8v with a relaxed timing for reliability reasons.

 

[greekman506]

5-5-5-18 timing.
Cas latency. 5
240 pin.
1.8V
800mhz
Its very good ram? Yes or no.

 

[BFG-9000]

No. But it's better than RAM that many OEM machines came with such as Ramaxel 6-6-6

 

[greekman506]

What? Its original Corsair. Its not fastest 800?

 

[BFG-9000]

As you can see from the list I linked to, Corsair sold a Cas3 version at 800 with timings 3-4-3-9. Surely you don't expect 5-5-5-18 is just as good?

That's like saying Chevy makes a Corvette so my Chevette must be the fastest.

 

[4745454b]

Corsair is the brand, not the speed. Corsair is a good brand, but depending on the sticks you have they might be slow.

DDR2-800 wasn't the fastest DDR2 ram. 1066 is faster, and I think there were even some super uncommon 1333 DDR2. They would have had bad timings, and I think you had to have active cooling on them because they needed 2.3V to work. But those would be the "fastest" DDR2 ram sticks.

 

[greekman506]

Ok. My motherboars run 800mhz max.
Can u see it?

 

[greekman506]

Hp dc7800 convertible minitower. Is my pc.
So i know is 8max ram.
But fsb?

 

[4745454b]

Lets try this. Why are you upgrading the ram? Meaning what are you trying to do? What DDR2-800MHz ram is available where you are? Let's make this simple.

 

[greekman506]

Lets try this.
Knows somenone if my system takes 1066 or 1333ram?

 

[COLGeek]

See here for compatible memory:

http://www.crucial.com/usa/en/compatible-upgrade-for/HP---Compaq/dc7800-series-convertible-minitower

Don't overthink this.

 

[USAFRet]

Lets try this.
Knows somenone if my system takes 1066 or 1333ram?

From HP: http://h10032.www1.hp.com/ctg/Manual/c01162204
DDR2-SDRAM DIMMs
For proper system operation, the DDR2-SDRAM DIMMs must be:
● industry-standard 240-pin
● unbuffered PC2-5300 667 MHz-compliant or PC2-6400 800 MHz-compliant
● 1.8 volt DDR2-SDRAM DIMMs
The DDR2-SDRAM DIMMs must also:
● support CAS latency 5 DDR2 667 Mhz (5-5-5 timing), CAS latency 5 DDR2 800 Mhz (5-5-5 timing),
and CAS latency 6 DDR2 800 Mhz (6-6-6 timing)
● contain the mandatory JEDEC SPD information

 

[greekman506]

Ram and sdram diferrence?