Is ocz EB really worth it over pc4000 in a a64 setup?(paging hitech)

[hitechjb1]

As I pointed out earlier, I said DDR500, DDR550 means trying to get memory modules that can run 250 - 300 MHz. It does not refer to DDR500 (PC4000) literally.

The DRAM chips used in each memory module are more important than the rating such as PC4000.

For 3200+ with x10 multiplier, you will get memory bus equal to CPU/10 (at 1:1 ratio) or CPU/12 (at 5:6 ratio).

For 1:1 memory:FSB ratio,
memory_bus_frequency = CPU/10
so if CPU = 2.5 GHz, memory_bus = 250 MHz.

PC3200, even for BH-5, would be hard to run at 250 MHz without a Vdimm mod using 3.0-3.3 V.

Generic PC4000 is rated to run at 250 MHz, but the latency may not be as good as EB. As many has pointed out, the EB modules will enable high memory bus 250+ MHz at small equivalent latency. You have to make your decision based on your budget.

Or get some modules that use the same DRAM chips as EB.

 

[Thecalmingapple]

What timings at 250mhz can I expect from the EB and at what voltages? Will the performance of the hynix d5 ram at 2.5-3-3-5/[email protected] be comparable in real world performance to the EB? As long as it has the same overclockability, I am not concerned with benchmarks...I just want the best for my money.

 

[hitechjb1]

I don't have hand on experience with EB, but this is what I summarized from some tests by anandtech on A64.

Reviews on memory modules for A64 platforms

Here links to informations on memory modules for A64 754, 939 platforms. Will add and update this post over time.


A favorable review of OCZ3700EB memory modules 2x512MB on a Chaintech VNF-250 motherboard (Nforce3 250 chipset) w/ a A64 754 3200+. The memory module, rated DDR446, achieved a max stable speed of DDR550 (275 MHz) CAS3, using 2.8-2.9V (more room to go with higher voltage plus cooling). Separately, it achieved DDR524 on an Intel system. .... On the A64, tested 200x10 2.5-2-3-10 (4xHT), 214x10 2.5-2-3-10 (4xHT), 238x9 3-2-3-10 (3xHT), 250x8 3-2-3-10 (3xHT), 268x8 3-2-3-10 (3xHT), BW of 4137 MB/s (int/float) obtained, highest memory speed 275x7 (lower CPU) achieved, ....
http://www.anandtech.com/memory/showdoc.html?i=2057&p=1

Wanting to see how the dual channel 939 would perform running at such high memory speed, ....

 

[shard]

where the hell do yu get the OCZ EB?

 

[Vio1]

I cant wait to get mine.. I bought them off a guy from this forum... oh i do hope they arrive tomorrow. It will be my first time running a system with 1gb ram!

 

[aldamon]

The impact of running non 1:1 memory:FSB ratio on memory bandwidth efficiency has been discussed and established few months back, and found to have minimum or no impact on memory efficiency. This is also illustrated by d]g[ts's results in the two links he listed, attaining 97% efficiency in both cases.

So, with the A64, it's ALWAYS beneficial to run the FSB as high as possible while still maxing out the memory and HTT multiplier? Interesting.

Two examples that will hopefully be applicable to my situation:

1.)

320 HTT x 7.5 = 2400 Mhz x 5/6 divider = 265.6 Mhz Memory with a 3X HTT multiplier = 960 Mhz HTT

2.)

267 HTT x 9 = 2403 Mhz x 1/1 divider = 267 Mhz with a 4x HTT multiplier = 1068 HTT

Since there's supposedly no performance hit associated with running a memory divider, option 1 would always be better even with the lower HTT? It's going to take a while to get used that if it's true. I always thought the HTT would have to be bumped substantially to overcome the performance hit of having a memory divider enabled at all. There is no latency introduced at all with the memory dividers?

 

[MiNdWaRp]

where the hell do yu get the OCZ EB?

http://www.newegg.com/app/viewProductDesc.asp?description=20-146-985&depa=0

 

[Gregory_WE]

Supposedly the memory divider makes it run at around 97% efficiency, so it's pretty good.

With the 2nd one, I'm not sure if you'd be able to run 1068 HTT stable.

 

[shard]

ooooh, yummy ram!

that is real good ram!

from what i have heard, the A64 systems, done get hit as hard wiht mem dividers

i my self am going to save myself some money and just run at 5/6, mem dividider, so all i am going to get is the OCZ EB PC3500 1GB

but do they even have the PC4000? the OCZ EB i mean!

 

[Maxvla]

i dont know alot about the a64 characteristics, but first of all u have to have a good idea of how fast the cpu will go (fsb) secondly how well will the mb run?? will it run over 250? 3rd is the ratio.. will it run well 1-1 or maybe even 5/6 like maxvala' s a64 ran. i wouldnt get ANY ram till i knew these basics first..

mine was 1:1 301fsb

http://www.maxvla.com/host/komusa4200b.jpg