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Okay, tech nerd friends. Here's a first-world problem tech question: I built my PC with 64GB (2x32) of DDR5 Patriot Viper RGB 5500 1.25v memory with the intent to add another 64GB later. So, NOW it's later. I thought I was purchasing the same kit that came with the initial build. It turns out I missed by a little, and I didn't catch it. The new set is 2x32 DDR5 Patriot Viper RGB 5600 1.35v. In the old days this wouldn't;t have been a problem at all since XMP was not a thing and I would just adjust everything in BIOS manually.
 
I'm new to XMP, as my last system build was older. Enabling XMP with both kits installed keeps the computer from posting (yes, I already know it's the mismatched voltages, but that's not the question). Disabling XMP, everything works fine, but I'm taking a performance hit by manually tuning. BIOS seems to indicate that it's running everything at the higher voltage, which should be okay. How much performance am I really losing without XMP enabled? All this is academic as I have already purchased a duplicate of the faster set since I just looked, and it was on sale for about $30 cheaper than my original purchase. 
 
In the meantime, for information perpouses, which would have better performance? 64GB running with XMP enabled or 128GB without?
 
Full System Specs:
ASUS Z890 Max Gaming WIFI7
Intel Ultra 9 285K
64GB Patriot Viper RGB 5500 1.25v (64GB Patriot Viper RGB 5600 1.35v)
4TB Patriot Viper NVME
4TB PNY NVME
RTX 4080
 
Edit: My research indicates I could, in theory, just enable XMP profile "2" for the higher voltage on everything, but I couldn't get it to work that way. While frustrating, this is not the end of the world. Everything runs great either way; I will sell off the original kit when the new matched one arrives. So, if anyone needs 2x32gb of DDR 5, give me a couple of weeks and maybe we can make a deal? 
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52 minutes ago, x8xid82 said:

I'm new to XMP, as my last system build was older. Enabling XMP with both kits installed keeps the computer from posting (yes, I already know it's the voltages,

it's not just voltages, it's DDR5 overall

 

4 sticks don't fly easily in DDR5, at least when it comes to OCing it with XMP/EXPO

 

52 minutes ago, x8xid82 said:

How much performance am I really losing without XMP enabled?

depends on what you're doing

 

53 minutes ago, x8xid82 said:

If the performance hit is minimal, I'd rather not deal with the RMA and exchange bullcrap right now.

Creative apps, rendering even, etc. minimal hit

 

Gaming, similar, bit higher hit.

 

54 minutes ago, x8xid82 said:

It's likely that later, after my tax return, I will simply buy a full 128 kit all at the same time to ensure everything is identical. I'm just trying to decide if it's worth keeping the new 64GB set and using it until then without XMP and selling it for a loss later when I upgrade.

running 4 sticks in XMP is already difficult on DDR5 by default

 

55 minutes ago, x8xid82 said:

TL;DR - Which is better 64GB running with XMP enabled or 128GB without? 

both, more GB if you need more GB, XMP 64GB if the low latency causes performance issues/decrease that is noticeable (videogames are only example I can think of)

 

56 minutes ago, x8xid82 said:

Full System Specs: 

ASUS Z890 Max Gaming WIFI7

Intel Ultra 9 285K

64GB Patriot Viper RGB 5500 1.25v (64GB Patriot Viper RGB 5600 1.35v)

4TB Patriot Viper NVME

4TB PNY NVME

RTX 4080 Super

If 4 sticks post 128GB without XMP, they are compatible enough that the PC posts.

 

If the config was wrong, 4 sticks wouldn't even post with XMP disabled.

 

How fast are the base speeds of the RAM? 4800? Base speed isn't slow for some tasks, because even if sticks run at slower Mhz, they usually run on tighter timings.

Note: Users receive notifications after Mentions & Quotes. 

Feel free: To ask any question, no matter what question it is, I will try to answer. I know a lot about PCs but not everything.

current PC:

Ryzen 5 5600 |16GB DDR4 3200Mhz | B450 | GTX 1080 ti [further details on my profile]

PCs I used before:

  1. Pentium G4500 | 4GB/8GB DDR4 2133Mhz | H110 | GTX 1050
  2. Ryzen 3 1200 3,5Ghz / OC:4Ghz | 8GB DDR4 2133Mhz / 16GB 3200Mhz | B450 | GTX 1050
  3. Ryzen 3 1200 3,5Ghz | 16GB 3200Mhz | B450 | GTX 1080 ti
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Thank you for the response. Good info. It's academic at this point now. I re-ordered off my last order to get the exact same kit; I was looking at my history and it happened to be on sale for $30 cheaper than my previous order. I double-checked with a fine-toothcomb to ensure it was the EXACT same kit. It's a little frustrating the Patriot made so many of the same kit with slightly different specs, but they are all branded identical. It's still my fault, though - When it comes in, I'll swap, enable XMP, and have the best of all situations, and a buddy said he wanted to buy my original RAM for what I just paid for the sale price, so I'm out zero money, just time. It allows me over the next 2 weeks to benchmark a bunch of stuff with the current setup to compare when the new memory comes in. It will be nice to see exactly how much performance XMP provides in real-world applications. 

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