Three RAM modules, dual chanel

[domining]

Hey everyone!

As one of my Patriot Viper 4GB (2 x 2GB) modules is dying, (I have tested them together and one by one few times), I'm planning on putting in new kit of two. Looks like I'm getting these http://goo.gl/4BPFYv .

So, the thing is. I have GA-EP45-DS3 rev 1.0 mothoerboard and I'm running current RAM on dual channel so I want to do the same with new ones. As long as I'm using only the new ones it shouldn't be a problem, but I want to keep the old working one, so I could have 6 GB RAM.
New and old RAMs have different timings. Old: 5-5-5-15, New: 5-7-7-25.

Will the old one be slowed down to match the new ones? Is it ok to have configuration like this?
Will I be able to set timings manually in BIOS for each chanel?

Thanks!

 

[wdmfiber]

They all have to run at the same speed. In this case you would set your timings at 5-7-7-25 in the bios.
In daily PC operations you won't notice a "slow down".

Have you tried running the "dying" module at a slower latency. It might be fine if you try running it at 5-7-7-25 Although 1066 MHz is slow vs. today's high MHz ram. Timings of 5-5-5-15 are very quick. About as quick as you can get(9.38 ns). Slow it down, you'll prob just asking too much of the aging dimm.

 

[EasyLover]

Channel is created on the basis of RAM capacity. There will be likely two Dual Channels if you opt for this config. You can change the timings manually in the BIOS. Timings of the new RAM will be lowered to match the old ones.

There is as such no issue with this config.

Yes, you can manually change the timings in the BIOS.

 

[domining]

They all have to run at the same speed. In this case you would set your timings at 5-7-7-25 in the bios.
In daily PC operations you won't notice a "slow down".

Have you tried running the "dying" module at a slower latency. It might be fine if you try running it at 5-7-7-25 Although 1066 MHz is slow vs. today's high MHz ram. Timings of 5-5-5-15 are very quick. About as quick as you can get(9.38 ns). Slow it down, you'll prob just asking too much of the aging dimm.

No. I have not. It either was automatic or 5-5-5-15. Also, does chaning Mhz can impact anything but the speed?