Kingston vs. OWC memory

Personally..I would rather run all four slots and go 16 or 32. That 24 setup is really not that ideal. Besides at 1333..the chips will gear down to 1066 anyways because your slots are made for 1066 and not 1333. Save up to 32 or just go at 16. I use adobe products and since they use the GPU intensive programs using the Mercury Playback Engine..my needs of going above 16 has really been not been an issue with running out of memory.

Dont' know if the memory will go to 1333 after the upgrade. Another is it is best to have your memory in even pairs. If you have odd sticks then the old concept of dual channel memory is compromised. So it would be best to go with 4 sticks at 16 or 32. The price won't be that great of a difference nowdays. As for upgrading your CPU to 6 core..you will have to talk to the person who is doing the upgrading on whats best. I noticed that OWC doesn't even offer that service anymore on 2010 5,1 quad machines. They may think that another Macpro is around the corner and the demand is not warranted anymore. Also I believe all OWC ram is pretested to work together in their kits but as long as you are using quality ram...i found I haven't found that much of difference. Just stay from knockoffs that are not from quality manufacturers and you should be fine. Check to see if Kingston makes 4 stick setups for 32gigs and compare prices.

macstatic said:

How does Kingston Mac Pro specific memory compare to OWC's?
I know OWC memory is recommended by "everyone" in the Mac communities but alas I don't live in the US and with shipping, import duties (and the added cost and hassle of returning it in case of issues) I'd rather buy locally which means other brands.

I have a 4-core 2.8GHz Mac Pro 5.1 (2010) and found a 24GB Mac Pro kit from Kingston (KTA-MP1333DRK3/24G). I had 32GB in mind, but they don't have that so I assume I'd be fine with adding just an 8GB stick (KTA-MP1333/8G). Would this work even though this obviously means I wouldn't get a "matched pair sets" as OWC would supply?

Note: I'm opting for 1333MHz memory in case I upgrade my 4-core processor to a 6-core.

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Kingston has a good reputation here but I've personally had outstanding customer service with OWC. Take a look at Crucial as well. They have also been solid and cost effective.

If you drop a hex-core in, then your memory will run at 1333 MHz, but only if you're running in triple channel mode, i.e. you have 3 identical DIMMs in slots 1-3.

If you put a DIMM in slot 4, then they'll all drop back to 1066 MHz.

Kingston

You cant go wrong with Kingston memory... I bought 24Gb - 3 x 8Gb of KTA-MP1333/8G and and it worked like a charm on my 2.66GHz Quad-Core 2009.
It will clock down to 1066MHz but if you upgrade the CPU you can get the full speed of 1333MHz.
Dont go with the DR kit..get the single KTA-MP1333/8G

The KTA-MP1333DR/8G is Registered ECC module... the KTA-MP1333/8G is Unbuffered ECC module. Its not a huge difference but I would go for Unbuffered module..

If you can use MORE than 24GB, get the 32GB kit. But if your usage is going to only be in the 16-24GB range, save $40 and get the 24GB kit.

As far as speed goes between 1066MHz and 1333MHz RAM you're only going to see 0-3% difference depending on the app.

http://www.anandtech.com/show/2792/13

macstatic said:

I have no idea what the difference is between registred and unbuffered ECC modules and neither why Kingston has chosen two different standard for their 24GB kit vs. single 8GB modules,...

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The important thing to remember is that you cannot mix registered with unbuffered memory modules. Other than that you could actually choose most ECC DDR3 modules with thermal sensor from Kingston for your Mac Pro since it is just one of the workstations/servers running Intel Xeon processors. Unfortunately most sellers (including Amazon and NewEgg) do not always provide thermal sensor info on their products, so you may need to Google it for the spec. I recently got this 32GB kit used from Amazon for less than $105 for my 2009 MP. The registered modules do run a little hotter than unbuffered ones, otherwise they work fine even though they are not labeled for MP.

Since 2009 all the MacPro machines are triple channel which means they perform best when running in multiples three...one DIMM per channel. Forget the old pairing rules of yesteryear. Peak performance in triple channel machines comes when multiples of 3 are installed.
Will they run with 2 installed?.yes. Will they run with 4?..yes. But with 2 installed you are not fully utilizing the full triple channel data path. With 4 installed you are forced to have 2 DIMM share that third channel causing a slight bandwidth performance drop.
Three 8GB for 24GB is the hot ticket for best bang for the buck today.

Mac RAM Direct is first rate supplier that have earned my loyalty. Here's what they have: http://macramdirect.com/macpro.html#mp4y
They ship globally and fill Customs forms as $10 "Warranty Replacement Parts" to slip through VAT.
I've had way to many problems with OWC RAM and SSDs and will no longer use them.
There are 16GB DIMMs out now for your machine as well. They only come as Registered which is totally fine but you don't want to mix with non-registered.

Best luck!

cal6n said:

If you drop a hex-core in, then your memory will run at 1333 MHz, but only if you're running in triple channel mode, i.e. you have 3 identical DIMMs in slots 1-3.

If you put a DIMM in slot 4, then they'll all drop back to 1066 MHz.

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Huh? I upgraded my pro to a hex core 3.46 Ghz 3690 and added 4x 8 gb Ram for 32 GB and it runs fine at 1333MHz?

Wow. That's odd. Mine definitely gets down-clocked.

cal6n said:

Wow. That's odd. Mine definitely gets down-clocked.

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Yours reads as an "Early 2009". Maybe the 4,1 firmware doesn't allow 1333 MHz RAM?

(I didn't even think it was possible to put a hexacore in the 4,1 without updating the firmware.)

cal6n said:

Wow. That's odd. Mine definitely gets down-clocked.

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This is probably because the memory module in the 4th slot only supports 1066MHz clock speed. If the 4th one also came from the same kit, you have a very good reason to exchange it.

scott.n said:

Yours reads as an "Early 2009". Maybe the 4,1 firmware doesn't allow 1333 MHz RAM?

(I didn't even think it was possible to put a 6-core in the 4,1 without updating the firmware.)

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He did the firmware upgrade and that's why he could install a 6-core. As mentioned before, the "Early 2009" display is based on the serial number and has nothing to do with the firmware version. I recently upgraded to 2.93GHz 8-core for my 2009 MP without upgrading to 5,1 firmware, but it still shows 1333MHz memory clock speed because the X5570 supports it.

Whoops. I always just assumed the description was linked to the model identifier. Thanks for setting me straight.

xcodeSyn said:

This is probably because the memory module in the 4th slot only supports 1066MHz clock speed. If the 4th one also came from the same kit, you have a very good reason to exchange it.

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Ah, but I bought my Mac Pro as a 2.66 quad from a refurbisher with the RAM preinstalled and advertised as being DDR3 1066 MHz. So finding that it works in triple channel at 1333 MHz is a bonus, really.

He did the firmware upgrade and that's why he could install a 6-core. As mentioned before, the "Early 2009" display is based on the serial number and has nothing to do with the firmware version. I recently upgraded to 2.93GHz 8-core for my 2009 MP without upgrading to 5,1 firmware, but it still shows 1333MHz memory clock speed because the X5570 supports it.

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Yes, that's right.

Strange indeed. You're sure all 4 sticks are 1333?

As for the OP - get it locally, the cheaper the better. Don't fall for the marketing gimmicks, ram is ram is ram...

macstatic said:

Excuse my ignorance, but why shouldn't I get the 24GB kit?
It's a little cheaper than buying three separate Kingston 8GB modules, and aren't they the exact same modules, only with the kit they're matched?

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you should..

caymandrew said:

Strange indeed. You're sure all 4 sticks are 1333?

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Oh, yes. There's 2 pairs of identical Hyperam DIMMs marked as 16 GB kits

As for the OP - get it locally, the cheaper the better. Don't fall for the marketing gimmicks, ram is ram is ram...

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True up to a point, but only for some users.

First, there's the question of error checking. I know the 2006-2008 Mac Pros absolutely required FB ECC memory, while the 2009-2012 models will happily boot with plain old DDR3. Then there are the temperature sensors, present on Apple's RAM but absent at the budget end of the market. For many users, these are more than simply nice features. They're crucial safeguards for a high-powered workstation.