OCUK Memory FAQ
- Thread starter 3xtemelyk3wl
- Start date
Registered DRAM is a memory module that contains so-called "registers" that hold the data for one clock cycle before it is moved on to the next stage in the pipeline. This process increases the reliability of high-speed data access. Registered memory modules are typically used only in servers and other mission-critical systems where reliability is king.
ECC stands for "error correcting code." Like parity memory (normal memory is non-parity), ECC memory detects and reports memory errors. However, while parity can only detect errors, ECC can actually correct errors without interrupting the other operations of your system. As before, you would only ever use ECC with a sever or something similar.
Both registered and ECC severly limit the overclocking capability of your memory. Making high speed registered Dimms is VERY expensive, which is why AMD may have made a faux-pas with the athlon 64 in that respect (it needs registered Dimms as an ABSOLUTE requirement)
ECC stands for "error correcting code." Like parity memory (normal memory is non-parity), ECC memory detects and reports memory errors. However, while parity can only detect errors, ECC can actually correct errors without interrupting the other operations of your system. As before, you would only ever use ECC with a sever or something similar.
Both registered and ECC severly limit the overclocking capability of your memory. Making high speed registered Dimms is VERY expensive, which is why AMD may have made a faux-pas with the athlon 64 in that respect (it needs registered Dimms as an ABSOLUTE requirement)
Permabanned
- Joined
- 4 Sep 2003
- Posts
- 93
Excellent thread THANKS 
This should be made a sticky IMHO, or there should be a sticky with links to useful threads like this.
This should be made a sticky IMHO, or there should be a sticky with links to useful threads like this.
Associate
It said in the 1st post that you only see a performance increase in dual channel over single channel when using integrated graphics. Is this true?
yes and no.
on amd systems, where the processor uses only half the available bandwidth of dual channel, the integrated graphics is better positioned to take advantage of the other half, but i think in fairness a normal graphics card would be able to use it a least a bit.
on intel systems, the processor uses the whole of the dual channel bandwidth, so you see a much bigger performance boost.
on amd systems, where the processor uses only half the available bandwidth of dual channel, the integrated graphics is better positioned to take advantage of the other half, but i think in fairness a normal graphics card would be able to use it a least a bit.
on intel systems, the processor uses the whole of the dual channel bandwidth, so you see a much bigger performance boost.
Associate
extremely informative one of the best faqs I have ever seen,(no *****)
)
Associate
nice
Soldato
I had Corsair PC2400 once which was rated at 150Mhz and there is also PC4200 now
I've had a GA-7DXR (AMD 761) motherboard for over 2 years now, but ever since it was new I've been running it at the performance memory timing settings someone recommended me. They were:
DRAM PH Limit: 8
DRAM Idle Limit: 8
DRAM tRC Timing Value: 8
DRAM tRP Timing Value: 2
DRAM tRAS Timing Value: 6
DRAM CAS Latency: 2
DRAM tRCD Timing Value: 2
I've recently been experimenting with these timings, and have found those that give me the best memory bandwith in Sandra are:
DRAM PH Limit: 16
DRAM Idle Limit: 12
DRAM tRC Timing Value: 3
DRAM tRP Timing Value: 1
DRAM tRAS Timing Value: 2
DRAM CAS Latency: 2
DRAM tRCD Timing Value: 2
My computer unsurprisingly crashed when I set tRCD to 1T, but I wsa surprised how low tRP, tRC and tRAS would go. However, changing tRAS seemed to have no effect on the benchmark (using values between 6 and 2). It was the changes to tRP and tRC which really made the improvements. Overall, I got a fairly small increase from 1963/1861 MB/s to 1982/1887 MB/s.
What I want to know is:
1. Is it safe to leave these settings? When I first got this motherboard I heard it was unsafe (data corruption) to run tRAS below 6, but it seems to be running at 2 with no problem!
2. Why am I able to set tRAS, tRP and tRC so low? My memory is 256Mb Crucial PC2100 CL2.5 rated, and I have it running at 140MHz (multiplier-locked CPU is maxed out at 15x140 at default voltage).
3. Why does reducing tRC have more of an effect on performance than tRAS when tRC isn't even mentioned in the first post!
Thanks for any help
DRAM PH Limit: 8
DRAM Idle Limit: 8
DRAM tRC Timing Value: 8
DRAM tRP Timing Value: 2
DRAM tRAS Timing Value: 6
DRAM CAS Latency: 2
DRAM tRCD Timing Value: 2
I've recently been experimenting with these timings, and have found those that give me the best memory bandwith in Sandra are:
DRAM PH Limit: 16
DRAM Idle Limit: 12
DRAM tRC Timing Value: 3
DRAM tRP Timing Value: 1
DRAM tRAS Timing Value: 2
DRAM CAS Latency: 2
DRAM tRCD Timing Value: 2
My computer unsurprisingly crashed when I set tRCD to 1T, but I wsa surprised how low tRP, tRC and tRAS would go. However, changing tRAS seemed to have no effect on the benchmark (using values between 6 and 2). It was the changes to tRP and tRC which really made the improvements. Overall, I got a fairly small increase from 1963/1861 MB/s to 1982/1887 MB/s.
What I want to know is:
1. Is it safe to leave these settings? When I first got this motherboard I heard it was unsafe (data corruption) to run tRAS below 6, but it seems to be running at 2 with no problem!
2. Why am I able to set tRAS, tRP and tRC so low? My memory is 256Mb Crucial PC2100 CL2.5 rated, and I have it running at 140MHz (multiplier-locked CPU is maxed out at 15x140 at default voltage).
3. Why does reducing tRC have more of an effect on performance than tRAS when tRC isn't even mentioned in the first post!
Thanks for any help
nice post, also whats the sound from in ur sig "3xtemelyk3wl" also have you got msn, wanna have a word with ya email me at [email protected], cheers, once agai nice post.
Soldato
very informative, thanks a lot. 
also, the KHX memory hasnt been mentioned at all, is it inferior to the Corsair LL stuff?
the sound in his sig is from Full Metal Jacket if im not mistaken
- Brilliant film
also, the KHX memory hasnt been mentioned at all, is it inferior to the Corsair LL stuff?
the sound in his sig is from Full Metal Jacket if im not mistaken
- Brilliant filmStarsky
S
Starsky
Oh dear have i made a mistake with my RAM purchase
I have an MSI NEO FI2R mobo with an Athlon 64 3200
Will OCZ El-DDR PC4000 Dual channel 2x512mb work on this setup?
I am currently running Twinmos 3200 2x512mb and the system just does not run stable - especially when playing games
I was hoping the RAM swap would sort things out but onthe back of the pack it says use the OCZ 3200 RAM for the A64!!!
Well I guess I will have to put it in and try!!!
I have an MSI NEO FI2R mobo with an Athlon 64 3200
Will OCZ El-DDR PC4000 Dual channel 2x512mb work on this setup?
I am currently running Twinmos 3200 2x512mb and the system just does not run stable - especially when playing games
I was hoping the RAM swap would sort things out but onthe back of the pack it says use the OCZ 3200 RAM for the A64!!!
Well I guess I will have to put it in and try!!!
Soldato
You can use PC4000, but it will just run at a slower speed, which is kinda bad since PC3200 is propably cheaper
Associate
Ok, ive read the post and i understand it, but when someone goes their ram is e.g. 2.5-3-3-7 what part means what?
I know the 2.5 is the latency, but not much else.
I know the 2.5 is the latency, but not much else.
Associate
A well constructed FAQ.........helped me a lot
Cheers
Cheers
Associate
Thanks a bunch m8..
Didnt realise u dont notice the difference between single and dual channel modes when not using integrated graphics :O
Didnt realise u dont notice the difference between single and dual channel modes when not using integrated graphics :O
normski
N
normski
help
i was told that dual channel ddr board with matching pair of ddr would make my gamming better and make my pc run faster is this correct i have read above and put this quote in as i do not know what intergrated graphics are