Which ram for this pc?

[runzwithsizorz]

Which ram would you recommend for this build? (Performance/bang for the buck)

Graphics card: MSI Radeon HD 7870 Hawk

Mobo:
Asus P8Z77-V Pro LGA 1155


[FONT=&quot]CPU
[/FONT]
[FONT=&quot] I[/FONT][FONT=&quot]ntel core i5 3570k Ivy Bridge 3.4 Ghz [/FONT] oc 4.4 Running stable
PSU 650w



Both ram are GSkill ripjaws 8 gig (2




DDR3 1866 (PC3 14900) (Price 53.00 w gift card and promo)
· Timing 9-10-9-28
· Cas Latency 9
· Voltage 1.5V

· DDR3 2133 (PC3 17000) (75.00 w gift card)

· Timing 9-11-10-28
· Cas Latency 9
· Voltage 1.65V



Thanks in advance,


Wife of Runz

 

[runzwithsizorz]

:wub: I messed up the spacing on above post...sorry.

 

[Cerb]

<=1.5V good. That's JEDEC spec.
>1.5V bad.

 

[zir_blazer]

<=1.5V good. That's JEDEC spec.
>1.5V bad.

Many high end modules use 1.65V, like these.

 

[Cerb]

Many high end modules use 1.65V, like these.

http://www.newegg.com/Product/Produ...Value=2599:50618&PropertyCodeValue=2599:29232

Looks to me like high-end models at the proper voltage exist, too.

 

[zir_blazer]

http://www.newegg.com/Product/Produc...e=2599%3A29232

Looks to me like high-end models at the proper voltage exist, too.

I don't see anything higher than 2133 MHz on that list. And that's for a reason: They can't. All these 65 2400 MHz modules uses 1.65V.

 

[nurturedhate]

He's running a 3570k. The only option is 1.5v. There's no reason to discuss 1.65v.

http://www.intel.com/content/www/us/en/processors/core/3rd-gen-core-desktop-vol-1-datasheet.html

page 11

 

[runzwithsizorz]

:whiste:So the bottom line is 1.65 volts not a good idea for my set up? I just want decent ram at a reasonable price for gaming. I am now leaning towards 1866 1.5 v.

 

[nurturedhate]

Go for the 1866. For gaming you won't notice the difference.

 

[runzwithsizorz]

Go for the 1866. For gaming you won't notice the difference.

Thank you.

The Wife

 

[zir_blazer]

He's running a 3570k. The only option is 1.5v. There's no reason to discuss 1.65v.

http://www.intel.com/content/www/us/en/processors/core/3rd-gen-core-desktop-vol-1-datasheet.html

page 11

Its funny than it also mentions this:

DDR3 and DDR3L DIMMs/DRAMs running at 1.5 V
No support for DDR3L DIMMs/DRAMS running at 1.35

Yet there are tons of 1.35V DDR3 modules on the market. And they do work on Ivy Bridge, regardless of official support for them or not. So do the 1.65V modules I linked earlier.
Heck, that Datasheet even mentions that Ivy Bridge only supports 1333 and 1600 MHz DDR3, not 1866 and over. So why bother with more than 1600, right?

Memory DDR3 data transfer rates of 1333 MT/s and 1600 MT/s. The DDR3 data transfer rates supported by the processor is dependent on the PCH SKU in the target platform:
— Desktop PCH platforms support 1333 MT/s and 1600 MT/s for One DIMM and Two DIMMs per channel

Remember that DDR3 modules got an SPD Chip where they usually carry several JEDEC standard profiles for the Motherboard to pick a safe one, chances are it got a 1333/1600 MHz 1.5V profile for compatibility reasons. Indeed, purchasing a more expensive 2133/2400 MHz high end module to run it at those settings would be a waste. But calling them bad because they aren't JEDEC standard isn't exactly intelligent when that is where you will usually find the better binned DRAM chips.
You also have the XMP profile that you can use if the Motherboard supports it to let it automatically configure them to run at the rated Frequency, or you can run it manually. The Processor Integrated Memory Controller will indeed run out-of-spec, but its akin to overclocking - Which he did, that its for what he purchased a K series, right?

 

[Cerb]

Heck, that Datasheet even mentions that Ivy Bridge only supports 1333 and 1600 MHz DDR3, not 1866 and over. So why bother with more than 1600, right?

If you can find some rated with tight timings, hell yes.

However, IB supports well in excess of 2.4GHz, just no guarantees it will run at those speeds (2800MHz, IIRC).

RAM speed simply does not translate into enough added performance to be worth much overvolting, in modern Intel CPUs.

 

[Blain]

If I were shopping for high quality memory, I would use the following parameters as a guide...

* DDR3 rated at 1.5v or lower
* DDR3 rated at the lowest CAS I could afford
* DDR3 rated at the highest clock speed I could afford
* Limit the scope of my purchease to G.Skill, Mushkin, Samsung, Corsair XMS or Crucial (non-Ballistix)

While not wavering on the voltage point, I would balance the other issues with my budget.

Remember, my goal is not pure "benchmarking" performance, but simply finding the highest quality memory I can afford. ^_^

The only reason I pay a premium for low latency, high speed, low voltage memory is...
Quality and quality alone.

1.5v is the JEDEC DDR3 voltage standard.
Stay with 1.5v or less if you can afford it..

What he said

 

[BigChickenJim]

Go for the 1866. For gaming you won't notice the difference.

I agree. If you're using the rig primarily for gaming you aren't going to gain anything substantial from "high-performance" RAM.

 

[runzwithsizorz]

Its funny than it also mentions this:



Yet there are tons of 1.35V DDR3 modules on the market. And they do work on Ivy Bridge, regardless of official support for them or not. So do the 1.65V modules I linked earlier.
Heck, that Datasheet even mentions that Ivy Bridge only supports 1333 and 1600 MHz DDR3, not 1866 and over. So why bother with more than 1600, right?




Remember that DDR3 modules got an SPD Chip where they usually carry several JEDEC standard profiles for the Motherboard to pick a safe one, chances are it got a 1333/1600 MHz 1.5V profile for compatibility reasons. Indeed, purchasing a more expensive 2133/2400 MHz high end module to run it at those settings would be a waste. But calling them bad because they aren't JEDEC standard isn't exactly intelligent when that is where you will usually find the better binned DRAM chips.
You also have the XMP profile that you can use if the Motherboard supports it to let it automatically configure them to run at the rated Frequency, or you can run it manually. The Processor Integrated Memory Controller will indeed run out-of-spec, but its akin to overclocking - Which he did, that its for what he purchased a K series, right?

Who would have thought that someone with only 60 posts could pretty much nail it. I tend to hang back and let Mrz Runz explore, and educate herself, if only sometimes just to validate things I have told her.
Thankz to all, MR. Runz

 

[DannyVekslender]

Go for the 1866 MHz... I can't see a real world difference.

It just cost less money and prodouce less heat (due to lower voltage).