2-2-2-4 good? also how are my speeds?

[moho]

hello
i bought an infineon pc2700 333mhz and am running it now at 178FSB, in my system in my sig.
i was wondering if these latencies are fast for this chip, i only have 1 stick of 256 and it is the infineon.
everest home reads it as 2-2-2-4, and also thats what i have it set as in the BIOS, also CPU-z doesnt support my MOBO.
speeds i get are:
PC2800 DDR
memory write: 964MB/s
memory read: 2686MB/s (i think normal for single channel)
memory latency: 134.5ns 2-2-2-4

passed memtest also.

my shipset is SiS655Fx. the default lanencies are: 2.5-3-3-7 for 166MHZ
screenshots:
http://home.comcast.net/~muhammadbintariq2/mem1.JPG
http://home.comcast.net/~muhammadbintariq2/mem2.JPG

[Sentential]

I am not specifically familiar with that chip, but for a piece of PC2700 that is quite good. I bet with enough tweeking and looser timings of 2.5-3-3 you could push toward DDR400 if your mobo has a PCI lock of course.

What voltage is this at?

[Zebbo]

I have exactly same chip on my Infineon PC2700 stick and I really think this is awesome. I'm able to do 185MHz (DDR 370) with tight 2-2-2-5 latencies, but now I'm running this at 245MHz (DDR 490) with loose 3-4-4-8. I think this is pretty good for cheap memory.

[beau_zo_brehm]

personally, I would run 2-2-2-8 or 9 because anything lower will cause memory dumping and essentially a slower system.

[moho]

yah, stock volts, prety nice memory if you tell me...
i think my mobo doenst have a PCI lock, ill have to double check though

[moho]

personally, I would run 2-2-2-8 or 9 because anything lower will cause memory dumping and essentially a slower system.
really?

[EWBatOVAclockin]

Alright newb with memory. What is the best timings for RAM? Just a quick question if yall dont mind :rolleyes: .


PEACE

[Sentential]

Alright newb with memory. What is the best timings for RAM? Just a quick question if yall dont mind :rolleyes: .


PEACE
Not a problem at all. However its gonna be a lenthy explination. If you could start your own thread about it we would be happy to help. I would do it here but i dont want to threadjack.

[moho]

no its ok, i wanna hear it also

[EWBatOVAclockin]

Why thank you moho for your generousity. If any one could help us with my question. Any advice would be appreciated.

PEACE

[moho]

well i tried to up the MHZ to DDR400, but it wont boot unless i default my CPU clock settings. i think ill have to leave it at PC2800 cause its still faster than a normal 2.4 with DDR400 memory. also, it the PCI latency timer a PCI lock?
it has likt settings of 32,64,128,256,512.
my mobo sucks, i cant change the dividers, or even set the DDR speed manually, its only 266/333/400/500. when i run my memory at PC2800, my cpu is at 178FSB, and the ddr rpeed is at 266, but runs at 178*2 weird hah?
well i wanna hear that speed thread sentential!

[gram_vaz]

be sure to run prime95 also. i've run latencies that passed memtest but gave me errors in prime95. remember, rounding errors means ur cpu doesn't have enough vcore. all other errors means ur cpu is oc'ed too far or ur latencies are too tight.

[TimoneX]

PCI latency adjust isn't any sort of clock lock, as I recall it varies the length of time a bus master may control the PCI bus.

[moho]

PCI latency adjust isn't any sort of clock lock, as I recall it varies the length of time a bus master may control the PCI bus.
didnt think it was a PCI lock, thanks

[beau_zo_brehm]

Actually guys, timings are overrated.

http://www.xtremesystems.org/forums/showthread.php?t=48634

And that was for an A64, a processor that was thought to love tight timings. Truth is, higher bandwidth with acceptable timings is better.

[moho]

i have overclocked my ram to PC3400, timings are now 2.5-3-3-4, i have much higher bandwidth, and faster time actually, about 134ns.

[Sentential]

Why thank you moho for your generousity. If any one could help us with my question. Any advice would be appreciated.

PEACE
Well it all depends on what your RAM is capable of and what chips it uses. In many cases people have much older board which is probably incapable of high FSB speeds. This was aslo the case on alot of AthlonXP boards.

When speed is a problem you should focus on latency. When speed isnt a problem you want to maximise bandwith when at all possible. Especially if your CPU is locked as it is in your case.

Since both of your motherboards has little issues with bus speeds you want to maximise the speed your RAM can possible handle. Because of this you would want your timings to read like this:

<???> 2-2-2-5
<yours> 3-4-4-9

With the looser timings of 3-4-4 (3=Cas latency) your top speed and your CPU mhz <since your CPU is locked> should increase dramatically.

Hopefully your RAM is Hynix. If so that would mean your maximum speed for your bus will fall around 260-280 depends on what type of Hynix you have. This is important because:

2600 / 200 = 13 (your native multiplier)
This would mean your top speed with the RAM synchronized would be anywhere from:

260 x 13 = 3380
to
280 x 13 = 3640

As you can see, YOUR benefits from using poor latency but high speeds are quite dramatic, where as somone on an older chipset *might* get another 10mhz on the bus vs your 60-80 because his chipset cannot handle it. This is what I meant by balance.

However you *can* run asynch with RAM dividers to maximise your CPU bus and keep the RAM bus low if you dont have Hynix or a fast form of RAM. The most common 2 dividers are:

5:4 (RAM is 75% of CPU bus speed = 166 or PC2700 or DDR333)
3:2 (RAM is 66% of CPU bus speed = 133 or PC2100 or DDR266)


If this was unclear in any way feel free to ask. I tend to omit alot of information :D

[Super Nade]

hello
i bought an infineon pc2700 333mhz and am running it now at 178FSB, in my system in my sig.
i was wondering if these latencies are fast for this chip, i only have 1 stick of 256 and it is the infineon.
everest home reads it as 2-2-2-4, and also thats what i have it set as in the BIOS, also CPU-z doesnt support my MOBO.
speeds i get are:
PC2800 DDR
memory write: 964MB/s
memory read: 2686MB/s (i think normal for single channel)
memory latency: 134.5ns 2-2-2-4

passed memtest also.

my shipset is SiS655Fx. the default lanencies are: 2.5-3-3-7 for 166MHZ
screenshots:


Hello,

What is your VDimm? (Did you max it out?)
Can you push it higher at extremely loose timings say 2.5-4-4-10 ?

[moho]

Hello,

What is your VDimm? (Did you max it out?)
Can you push it higher at extremely loose timings say 2.5-4-4-10 ?
my vdimm is 2.85V, which is the max for my board. i havent tried pushing it farther than PC3400, its currently the speed in my sig, ill have to tryo pushing it farther though...

EDIT: also forgot, my problem is the Ram speed in my Bios, its currently at 333, but running at PC3400, the next jump would be to put it at 400, which i guess will push the ram to like PC4000, so i am guessing it wont work, but ill have to try it

[Sentential]

my vdimm is 2.85V, which is the max for my board. i havent tried pushing it farther than PC3400, its currently the speed in my sig, ill have to tryo pushing it farther though...
If I were you I'd start running asynch and keep your memory in the PC3400 range. Try using 5:4 and try to max out the CPU.

[moho]

lol like i said before, this Darn mobo doesnt have the divider settings.....

[moho]

well i just tried the 400 setting, and with extreme loose timings, 3-4-4-9, and it didnt even boot up, i will try some new timings of 2.5-3-3-6 for now, maybe ill get a increase in performance or sumthing