RAM - 1600 MHz vs 1833 MHz

[patrickjp93]

Cycle time (time for a complete cycle; aka Period)= Frequency^-1

1600 MHz (DDR) -> 800 MHz; cycle time = 1/800000000 s = 1.25 ns

2133 MHz (DDR) -> 1066.66666 MHz; cycle time = 1/1066666666 s = 0.9375 ns

 

2133 MHz CL9 (9 clocks(cycle times)) -> CL 9*0.9375 = CL 8,4375 ns

1600 MHz CL7 -> CL 7*1.25 = CL 8.75 ns

 

Sorry for being late, I was out today all the time

Yeah I realized shortly after I fell asleep I'd forgotten about the definition of double data rate.

[patrickjp93]

Also If you've enough patience, you'd check all other latencies of a RAM kit (CL (CAS), RCD, RP, RAS, RC, RFC, RRD, WR, WTR, RTP, FAW...)

Unless you're running a multimedia server, the last 6 are irrelevant for almost any application. 

[patrickjp93]

Yeah you know digital circuits, if you want to be perfect even if it's for nothing really noticeable

I mean come on most technical documents on RAM only describe the first 8! I didn't even know the 3rd to last one at all. I had to look that one up.

[Harshith Mohan]

So , here's the thing.. In my country, there's a lot of difference in price between 1600 MHz and 2400Mhz
The price difference between 1600 and 1866 MHz is $60

and 2400 is double the price of 1600... So should I go for
Kingston HyperX with CAS 6-7-8-9

OR
Corsair Vengeance with 10-10-10-27

 

I know that less Latency is better but I want to ask the experts

[BiG StroOnZ]

So , here's the thing.. In my country, there's a lot of difference in price between 1600 MHz and 2400Mhz

The price difference between 1600 and 1866 MHz is $60

and 2400 is double the price of 1600... So should I go for

Kingston HyperX with CAS 6-7-8-9

OR

Corsair Vengeance with 10-10-10-27

 

I know that less Latency is better but I want to ask the experts

 

Where is there a Kingston HyperX kit that's Cas 6?

[Harshith Mohan]

Where is there a Kingston HyperX kit that's Cas 6?

oh wait.. Sorry! A shopping website of my country wrote it wrong I think

Can u check it for me? This is the model number - KHX1600C10D3B1/8G

[BiG StroOnZ]

oh wait.. Sorry! A shopping website of my country wrote it wrong I think

Can u check it for me? This is the model number - KHX1600C10D3B1/8G

 

Both kits are Cas 10 which is bad for 1600MHz, try to find a Cas 8 kit.

[Harshith Mohan]

Both kits are Cas 10 which is bad for 1600MHz, try to find a Cas 8 kit.

Can u find one at Amazon?

[patrickjp93]

Where is there a Kingston HyperX kit that's Cas 6?

Depending on the capacity, there might actually be. I just know 7 is the best rating for 8GB sticks. For 4GB I've seen a few which are 6.

[patrickjp93]

Can u find one at Amazon?

http://www.amazon.com/G-SKILL-Trident-240-Pin-Desktop-F3-1600C7D-16GTX/dp/B009V50T7O/ref=sr_1_14?s=pc&ie=UTF8&qid=1404329062&sr=1-14&keywords=ram

 

I would have thought the Mushkin Redlines would be at a similar price point on amazon, but boy was I wrong...

If you want objective rankings on which kit will deliver the best performance, here are timings, scores (lower is better) and the models which are on those timings. All models are 8GB sticks. With 4GB capacities you can get a bit more speed, but the extra capacity is worth it imho. Notice way towards the bottom you see the trend reverse itself

 

 

                      (LOW IS BETTER!)

SPEED     CAS      SCORE       MODELS

2400          10         8.3333         G.Skill Trident X, Corsair Dominator, Mushkin Redline, Patriot

2133           9          8.4428         G.Skill Trident X, Mushkin Redline, Corsair Dominator/Vengeance Pro

1866           8          8.5745         G.Skill Trident X, Mushkin Redline

1600           7          8.75             G.Skill Trident X, Mushkin Redline, Corsair Dominator Platinum

2400          11         9.1667         Same + Patriot, Kingston, PNY

2133          10         9.3809         AMD, Corsair, G.Skill, Mushkin

1866           9          9.6463         AMD, Corsair, Crucial, G.Skill, Mushkin Redline

1600           8          10.0             Crucial Ballistix/Tactical, Mushkin Redline

2400          12         10.0             (NO MODELS EXIST)

2133          11         10.319         Corsair, Patriot, G.Skill, PNY, Kingston

1866          10         10.718         (Too many to list)

1600           9          11.25           Corsair, Adata, Kingston, (too many to list)

2400          13         10.833         (NO MODELS EXIST)

2133          12         11.257         (NO MODELS EXIST)

1866          11         11.790         Kingston

1600          10         12.5             (too many to list)

 

1866          13         13.934         Mushkin

[BiG StroOnZ]

Can u find one at Amazon?

 

If you're going with Amazon.com I would just go with a CL10 2400MHz kit: 

 

http://www.amazon.com/gp/offer-listing/B0080F26M2/ref=sr_1_2_olp?s=electronics&ie=UTF8&qid=1404330318&sr=1-2&keywords=G.Skill+2400&condition=new

[patrickjp93]

If you're going with Amazon.com I would just go with a CL10 2400MHz kit: 

 

http://www.amazon.com/gp/offer-listing/B0080F26M2/ref=sr_1_2_olp?s=electronics&ie=UTF8&qid=1404330318&sr=1-2&keywords=G.Skill+2400&condition=new

Not sure what his storage capacity requirement is, but this scores 8.333 which is better than the best 1600 kits, by only a fraction of a nanosecond.

[KingKeith55]

I got 8 gigs of 1866mhz ram because it was on sale for cheap. (Kingston HyperX Fury black series dual channel kit) It is CAS 10 but it can be set to run at CAS 9.

[patrickjp93]

I got 8 gigs of 1866mhz ram because it was on sale for cheap. (Kingston HyperX Fury black series dual channel kit) It is CAS 10 but it can be set to run at CAS 9.

This raises a fair point: good RAM makers' sticks can generally have timings tightened. I personally run a set of Trident X 1600 at CAS 6 (Score of 7.5).

 

If money is a pressing issue go with a reputable maker like Corsair, Kingston, G.Skill, or Mushkin (I've never tried Crucial or Adata) with a slightly higher than desired CAS and try to tighten down to where you want. 7/10 sticks it works.

[Harshith Mohan]

If you're going with Amazon.com I would just go with a CL10 2400MHz kit: 

 

http://www.amazon.com/gp/offer-listing/B0080F26M2/ref=sr_1_2_olp?s=electronics&ie=UTF8&qid=1404330318&sr=1-2&keywords=G.Skill+2400&condition=new

I want a single 8gb ram please (for future upgrade)

Or suggest me 16gb dual channel kit

[patrickjp93]

I want a single 8gb ram please (for future upgrade)

Or suggest me 16gb dual channel kit

http://www.newegg.com/global/au/Product/Product.aspx?Item=N82E16820231628&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID= 16GB 1600MHz

 

http://www.newegg.com/global/au/Product/Product.aspx?Item=N82E16820231617&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID= 16GB 2133MHz

 

And there are 8GB single and 2-stick variants at lower costs on those same models of course. These are the best performing sticks in their class with the reviews to match. You can get Mushkin Redline for slightly better subtimings, but I haven't seen reviews above their 4GB sticks (which is strange because the reviews at those capacities are stellar).

[Harshith Mohan]

Oh.. sorry.. But can you give me links from Amazon.. I live in India..
Is this good?
http://www.amazon.com/Patriot-2400MHz-Desktop-Memory-Heatsink/dp/B00CRF9WR8/ref=sr_1_1?ie=UTF8&qid=1404409420&sr=8-1&keywords=Patriot+16GB+%282x8GB%29+Viper+III+2400MHz+CL10+-+PV316G240C0K

[Harshith Mohan]

http://www.amazon.com/dp/B0080FFZ8E/?tag=pcpapi-20

I checked that.. It doesn't ship to india

This thing ships to me

is it good?

http://www.amazon.com/Patriot-2400MHz-Desktop-Memory-Heatsink/dp/B00CRF9WR8/ref=sr_1_1?ie=UTF8&qid=1404409420&sr=8-1&keywords=Patriot+16GB+%282x8GB%29+Viper+III+2400MHz+CL10+-+PV316G240C0K

[Harshith Mohan]

I don't see why not: similar specs and also some latencies are lower (at least RAS) If you can, take it

Thanks for your help