Newegg via eBay has
64GB (2x32GB) G.SKILL Trident Z5 RGB 6400 DDR5 RAM (F5-6400J3239G32GX2-TZ5RK) for $214.99 - 20% off with coupon code
JULY4DEALS (apply at checkout) =
$171.99. Shipping is free.
Thanks to Staff Member
Eragorn for finding this deal.
Specs (
link):
- Memory Type: DDR5
- Capacity: 64GB (32GBx2)
- Multi-Channel Kit: Dual Channel Kit
- Tested Speed (XMP/EXPO): 6400 MT/s
- Tested Latency (XMP/EXPO): 32-39-39-102
- Tested Voltage (XMP/EXPO): 1.40V
- Registered/Unbuffered: Unbuffered
- Err or Checking (ECC): Non-ECC
- SPD Speed (Default): 4800 MT/s
- SPD Voltage (Default): 1.10V
- Warranty: Limited Lifetime
- Features: Intel XMP 3.0 (Extreme Memory Profile) Ready
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Top Comments
The reason ddr5 6000 is generally considered the sweet spot for amd zen 4 is that the memory controller clock can be run at a 1:1 ratio with the the memory regardless of silicon quality (clock of 3000mhz, remember ddr is double data rate, meaning ddr5 6000mt/s is 3000mhz). For amd systems, in your bios make sure that uclck is set equal to mclck (the setting should be called something like uclk div1 mode), all non-defective zen 4 cpus should be capable of running the memory controller at 3000mhz without errors. With earlier agesa versions you'd have to win the silicon lottery in order to have a memory controller capable of running at 3200mhz with absolute stability, which is required to be 1:1 with ddr5 6400. Recent agesa updates have improved this, but it's still not absolutely guaranteed every zen 4 cpu will have a memory controller capable of running at 3200mhz. Additionally, you'll want to set your fclk to at least 2100mhz for ddr5 6400 memory, which once again not all zen 4 cpus are able to do. Therefore, the guidance of ddr5 6000 being the "sweet spot" still applies. Simply put, if you aren't interested in learning how to properly tune and stress test your system, just stick with ddr5 6000 for zen 4.
It's also important to remember that this 64gb (2x32) kit is dual rank rather than single rank like the 32gb (2x16) kits you'll normally see. There are some (very) minor performance benefits to having 2 ranks per channel, though this also means you won't be able to push the clock of this ram as high with overclocking.
Ultimately, if you truly need 64gb of ram, this is a rather good price. This is the cheapest I've seen in a while for a 64gb kit from a reputable manufacturer with hynix memory chips, which are the the best chips currently available (all higher end kits are simply using better bins of these chips). However, I'd caution gamers and those who don't have memory intensive workloads that require massive amounts of ram to stick with cheaper 32gb kits. Having 32gb is already overkill for gaming and essentially all non-productivity use-cases, and trying to future-proof based on capacity isn't worthwhile at all. A few years from now, if you end up needing more ram, you'll be able to get higher capacity and faster kits for less money.
21 Comments
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(215 * .8) + (215 * tax rate)
Is the same as
(215 * tax rate) + (215 * .8)
Funnily, even though they do the discounts and tax differently than I thought, the order still doesn't matter.
Dude. Literally just test it out yourself on any ebay item that is eligible for the July 4th promo, there's a lot of them.
And the correct formula should be for the final price (215*0.8*tax rate) + (215*0.8) = (215*0.8*(1+tax rate)) if they did the order correctly. Which is not the same equation as final price (215*tax rate) + (215*0.8) = (215*0.8) + (215*tax rate)
And the correct formula should be for the final price (215*0.8*tax rate) + (215*0.8) = (215*0.8*(1+tax rate)) if they did the order correctly. Which is not the same equation as final price (215*tax rate) + (215*0.8) = (215*0.8) + (215*tax rate)
(215 * .8) + (215 * 0.1) where 0.1 = tax rate
Is the correct formula. I've tested it out myself.
But either formula, I'm pointing out that order still doesn't matter.
(215 * .8) + (215 * tax rate)
Is the same as
(215 * tax rate) + (215 * .8)
Funnily, even though they do the discounts and tax differently than I thought, the order still doesn't matter.
Both of those are taxing at $215.
Swapping the order is not changing when the discount is applied. The 215 being multiplied by the tax is what's important.
Let's just use some solid numbers to make it easier. Tax in NY is .08875.
With the way ebay's coupon works:
(Price of item) + (Cost of tax)
(215 * .8) + (215 * .08875)
172 + 19.08
191.08
In most other stores where coupon would reduce the price before tax calculation
(Price of item) + (Cost of tax)
(215 * .8) + ((215 * .8) * .08875)
172 + ((172) * .08875)
172 + (15.27)
187.27
(215 * .8) + (215 * 0.1) where 0.1 = tax rate
Is the correct formula. I've tested it out myself.
But either formula, I'm pointing out that order still doesn't matter.
Both of those are taxing at $215.
Swapping the order is not changing when the discount is applied. The 215 being multiplied by the tax is what's important.
Let's just use some solid numbers to make it easier. Tax in NY is .08875.
With the way ebay's coupon works:
(Price of item) + (Cost of tax)
(215 * .8) + (215 * .08875)
172 + 19.08
191.08
In most other stores where coupon would reduce the price before tax calculation
(Price of item) + (Cost of tax)
(215 * .8) + ((215 * .8) * .08875)
172 + ((172) * .08875)
172 + (15.27)
187.27
*The second calculation can be rearranged to be (215 * .8 * 1.08875) which is calculated together, ie what you call "before tax".
When it's calculated in series, that's what we commonly think of as before tax, when it's calculated in parallel, that's commonly thought of as after tax.
So all in all, the order isn't what's causing the difference, it's whether the discount and tax are applied in series or in parallel. This is often confused as order.
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