MacPro 4,1(5,1) Same memory speed after CPU Upgrade

[reddemonic]

Hi guys, i've successfully upgraded my QuadCore (W3520) to a HexCore (X5675) but my memory is still showing 1066mhz speed. it should be 1333mhz right? do i need perform PRAM or SMC Reset?
The memory i had installed before CPU upgrade was 10600R DDR3 and its still 10600R DDR3 after CPU Upgrade.

 

[flehman]

Is the RAM in your computer rated for 1333? It might only be 1066 rated. All of your RAM must be 1333-rated and you have to reset PRAM and SMC.

 

[reddemonic]

haha yes, it is!!

thanks m8, just did a PRAM reset.

 

[flehman]

Brilliant! I own a 4,1->5,1 as well and I remember going through some trial and error to get the 1333 RAM recognized (e.g. left 1066 RAM in by mistake).

 

[OB-NZ]

Hi guys, i've successfully upgraded my QuadCore (W3520) to a HexCore (X5675) but my memory is still showing 1066mhz speed. it should be 1333mhz right? do i need perform PRAM or SMC Reset?
The memory i had installed before CPU upgrade was 10600R DDR3 and its still 10600R DDR3 after CPU Upgrade.


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Hi, I have a question. Is that Ram running ok? Noticed that it is the low voltage kind, i.e. PC3L. Cant really find any good info as to how they are in a 5,1 Mac Pro.
Found some really cheap 8gb ones for about $30 USD each. Do all of your Ram sticks have PC3L on them, or just the one in the picture?

Ollie

 

[mikeboss]

it's not a good idea to run low voltage modules in a classic Mac Pro. they might fail sooner or later because of the higher voltage fed to them...

 

[OB-NZ]

it's not a good idea to run low voltage modules in a classic Mac Pro. they might fail sooner or later because of the higher voltage fed to them...

Do I stay away from R dimms also? If I went with R dimms would they all have to be R dimms? Sorry im just trying to get my head around all the kinds, also trying to avoid paying more than I need to. Would be great if I knew exactly what model Hynix, Samsung etc to look for.

Ollie

 

[mikeboss]

I don't use registered modules because they are a tiny little bit slower and also tend to get warmer. registered and unbuffered DIMMs shouldn't be mixed!

 

[OB-NZ]

I don't use registered modules because they are a tiny little bit slower and also tend to get warmer. registered and unbuffered DIMMs shouldn't be mixed!

Ok thanks for the heads up. Am wanting to head towards six 8gb sticks but can only afford maybe two at a time, do you happen to know if there would be any issues if I put two 8gb in with two 4gb and the remainder only 1gb DIMMs? All unbuffered ECC.

Ollie

 

[OB-NZ]

Judging from your benchmarks six 4gb DIMMs shouldnt be too shoddy aye? Just starting out with learning how to edit video and Photoshop e.t.c.

Geekbench V 3.2.2 (64-bit) Intel Xeon W3690 RESULTS MEMORY

3x4GB @1333MHz Single-Core Score 2202 Multi-Core Score 2834
4x4GB @1333MHz Single-Core Score 2010 Multi-Core Score 2295
3x8GB @1333MHz Single-Core Score 2465 Multi-Core Score 3240
4x8GB @1333MHz Single-Core Score 2142 Multi-Core Score 2539

 

[mikeboss]

yes, 6x4GB or 6x8GB will give you the highest possible performance (assuming you owning a dual cpu socket machine).

 

[OB-NZ]

yes, 6x4GB or 6x8GB will give you the highest possible performance (assuming you owning a dual cpu socket machine).

Really interesting. Yes have X5677 Xeons to put in , have done a ton of reading up but still pretty scared (2009). This weekend maybe if the 3mm thermal pad turns up.

 

[OB-NZ]

yes, 6x4GB or 6x8GB will give you the highest possible performance (assuming you owning a dual cpu socket machine).

Dammit, just realised that Im one step ahead of myself as usual, hopefully the new CPU upgrade goes to plan... Then wonder what the best Ram configuration is.