socket 754 and 3 full DIMMS

[otispunkmeyer]

if i add a third DIMM to my skt 754 system does it suffer the same fate that earlier Skt 939 chips do? ie having to run at 166Mhz instead of the prefered 200mhz?

 

[Rock Hydra]

It may depend. If it's using the AMD's processor it might. If the memory is controlled by a northbridge, it most likely wont' have that problem.

 

[otispunkmeyer]

Originally posted by: Rock Hydra
It may depend. If it's using the AMD's processor it might. If the memory is controlled by a northbridge, it most likely wont' have that problem.

you dont have a choice do you? the A64's on board memory control is the only option for memory control so

 

[otispunkmeyer]

bump

 

[klah]

It should be listed in the mobo manual.

AFAIK all s754 mobo manuals list the max supported speed for 3-dimms as 166MHz, but most if not all still function at 200MHz.

 

[mooojojojo]

It may be even worse. Check your motherboard manual. For instance my Asus K8N specifies that if I use 2 double sided sticks with 1 single sided, the memory will run at DDR200. So to run DDR333 with 3 sticks you will either need 2 single sided with 1 double sided stick or 3 single sided sticks.

 

[otispunkmeyer]

Originally posted by: mooojojojo
It may be even worse. Check your motherboard manual. For instance my Asus K8N specifies that if I use 2 double sided sticks with 1 single sided, the memory will run at DDR200. So to run DDR333 with 3 sticks you will either need 2 single sided with 1 double sided stick or 3 single sided sticks.

ahh poo i have a K8N-E deluxe lol

im just wondering since ive been readin BF2 reviews and one said the systems they played on (EA gave them i presume) had 9800pros, ( i have a 6800GT so im fine) but they had more than a gig of ram so im thinking an extra stick of geil 512mb 3200 wouldng hurt specially since DDR is so cheap right now

i mean i can get a gig of GSKILL 3200 ram thats easily capable of DDR480 and beyond for £80

 

[hippotautamus]

Pick up a 1gb stick and replace one of the 512s. It's s754, so you don't have to worry about dual channel

 

[otispunkmeyer]

oh geez that is poor

3 double sided dimms go to DDR200....pathetic, i assume the majority of 512 modules are double sided, i know for a fact the geil modules i have now are.

i can either run 3 single sided modules, ore 1 double and 2 singles to get DDR333....thats just not good enough really. the on die memory controller is a good idea but it has its pitfals

guess ill just leave it, since the extra memory isnt worth the performance drop. DDR200 is like half my bandwidth which is pretty much maxed at 3100. its not worth it

ill leave it till next upgrade which will be in a year or two.....dual core, 2gigs, G70 or R520 and lots of other things. my rig should last me till then

thanks for the help

 

[otispunkmeyer]

Originally posted by: hippotautamus
Pick up a 1gb stick and replace one of the 512s. It's s754, so you don't have to worry about dual channel

ill want matchin geil modules, and i can only get hold of a single 512 stick or a 2x512 DC kit or a 2x1gb DC kit. but thats closing in on £200 which i dont have.

BF2 should be okay anyway

im continually amazed at how well set up my system is. its routinely beats similar DC setups and if it doesnt it sure gives them a run for their money. its quite obvious that PCI-E and DC on A64 isnt really needed 90% of the time

 

[Concillian]

Originally posted by: otispunkmeyer
if i add a third DIMM to my skt 754 system does it suffer the same fate that earlier Skt 939 chips do? ie having to run at 166Mhz instead of the prefered 200mhz?

I was running 3x512MB with a Newcastle A64 2800+

Divider was already 166MHz (because HTT was overclocked to 240) so I dont' know if it was forced to 166. However it was not at all stable with 3 DIMMS with 1T command rate. Needed to be 2T.

200MHz RAM speed at 2T was fine though, though the divider was set to 166.

Right now I'm running 2x1GB 2-3-2-8 1T

At 1T, the system was VERY VERY unstable with 3 DIMMs, even if using 2 single sided 256MB DIMMs and 1 double sided 512MB DIMMs. I don't know that ever tried using the 100 divider, I didn't feel like going quite that low, but 166 and 133 both were not usable until I changed to 2T.

 

[otispunkmeyer]

Originally posted by: Concillian

Originally posted by: otispunkmeyer
if i add a third DIMM to my skt 754 system does it suffer the same fate that earlier Skt 939 chips do? ie having to run at 166Mhz instead of the prefered 200mhz?

I was running 3x512MB with a Newcastle A64 2800+

Divider was already 166MHz (because HTT was overclocked to 240) so I dont' know if it was forced to 166. However it was not at all stable with 3 DIMMS with 1T command rate. Needed to be 2T.

200MHz RAM speed at 2T was fine though, though the divider was set to 166.

Right now I'm running 2x1GB 2-3-2-8 1T

At 1T, the system was VERY VERY unstable with 3 DIMMs, even if using 2 single sided 256MB DIMMs and 1 double sided 512MB DIMMs. I don't know that ever tried using the 100 divider, I didn't feel like going quite that low, but 166 and 133 both were not usable until I changed to 2T.

id rather keep 1T timings

 

[Bar81]

Originally posted by: otispunkmeyer


id rather keep 1T timings

Why? It makes no noticeable difference in performance in the real world.

 

[Concillian]

Originally posted by: otispunkmeyer

Originally posted by: Concillian

Originally posted by: otispunkmeyer
if i add a third DIMM to my skt 754 system does it suffer the same fate that earlier Skt 939 chips do? ie having to run at 166Mhz instead of the prefered 200mhz?

I was running 3x512MB with a Newcastle A64 2800+

Divider was already 166MHz (because HTT was overclocked to 240) so I dont' know if it was forced to 166. However it was not at all stable with 3 DIMMS with 1T command rate. Needed to be 2T.

200MHz RAM speed at 2T was fine though, though the divider was set to 166.

Right now I'm running 2x1GB 2-3-2-8 1T

At 1T, the system was VERY VERY unstable with 3 DIMMs, even if using 2 single sided 256MB DIMMs and 1 double sided 512MB DIMMs. I don't know that ever tried using the 100 divider, I didn't feel like going quite that low, but 166 and 133 both were not usable until I changed to 2T.

id rather keep 1T timings

2T vs 1T is a performance difference, but only about 2-3% or so in games. I couldn't tell a difference in actual performance between 1T and 2T without benchmarking. However I sure noticed the benefit that the extra 512MB gave me (admittedly there were only a few and specific cases where there was a perceivable benefit)

Presumably you want 1.5Gigs for a reason (as in, it will bring a significant performance benefit for certain scenarios). In that case the benefit of 512MB more will far outweigh the small performance hit of running 2T on your timings.

If you're worried so much about 1T vs. 2T, that suggests to me that you may not actually need the extra 512MB in the first place.

If you are saying that you'd rather keep 1T performance but drop to DDR200 over DDR400 with 2T command rate, then you may be a candidate for being committed to an asylum. I hope that's not what you meant by your comment on rather keeping 1T.

 

[shoRunner]

i've got 2x512mb in my asus k8v-se deluxe and they are double sided and they are running fine at pc3200(1T), you just need to go and manually set it as that.

 

[Concillian]

Perhaps you misunderstood the topic at hand. The issue is 3 DIMMs. Two DIMM performance is not an issue for anybody as far as I know.