DDR4 2800 GHz and i5 7500 CPU

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Rubiksgocraft

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Nov 22, 2014
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Hello,

I am currently building a PC for my cousin and I built 2 other PC's previously. I have only ever built computers with DDR3 Ram and LGA 1150 CPU Sockets, but I am looking to build him a PC with an 1151 Socket so that it can last longer without needing upgraded.

I recently purchased G.Skill DDR4 2800 GHz Ram and am looking for a processor next. I found out that the CPU and Memory have to have compatible speeds and from the research I have done, I can't determine whether an i5 7400, 7500, or 7600 CPU is compatible with this RAM.

My question is, are these processors compatible with this RAM? If not, can I under-clock them to match? If the answer to both is no, what processor do you recommend for this RAM that won't break the bank?

Thank you for taking the time to read this.
 
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Satan-IR

Satan-IR

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You should base this on what the motherboard is rated to run the RAM at. Core i5 7xxxs are rated at 2133/2400Mhz as the standard.

But the motherboard (if RAM is compatible too) might be able to run 2800 (and higher if RAM is rated for higher) through enabling XMP which is a kind of RAM overclocking done on the RAM chip itself.
 
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Rubiksgocraft

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Nov 22, 2014
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The goal is to spend less then 500, but I have an absolute max at 600.
 
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Rubiksgocraft

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I always thought that the MB was what decided RAM, that is why I was very concerned when I was hearing that it matters to the CPU too. If the MB can handle 2800, what are the risks to the CPU if it can only handle 2400?
 
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vapour

vapour

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Aug 28, 2017
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yeah, Ryzen (AMD) is really picky as many rams don't work well with it.
 
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Rubiksgocraft

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I am not strictly purchasing new parts. I have had a large amount of success purchasing used components. I also am not going overboard on peripherals. Monitor, keyboard, mouse, and case will cost less then $75. It is a tight budget, but I can definitely do it.
 
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vapour

vapour

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Sure, my two builds:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Pentium G4620 3.7GHz Dual-Core Processor ($91.89 @ OutletPC)
Motherboard: ASRock - B250M-HDV Micro ATX LGA1151 Motherboard ($44.99 @ Newegg)
Memory: Patriot - Viper 4 8GB (1 x 8GB) DDR4-2400 Memory ($75.99 @ Newegg)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($40.99 @ Best Buy)
Video Card: Gigabyte - GeForce GTX 1050 Ti 4GB Video Card ($146.99 @ SuperBiiz)
Case: Zalman - T2 Plus MicroATX Mini Tower Case ($33.98 @ Newegg)
Power Supply: Corsair - CXM 550W 80+ Bronze Certified Semi-Modular ATX Power Supply ($34.99 @ Newegg)
Total: $469.82
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-10-23 19:58 EDT-0400

Or

PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 3 1200 3.1GHz Quad-Core Processor ($109.87 @ Amazon)
Motherboard: ASRock - AB350M Micro ATX AM4 Motherboard ($40.98 @ Newegg)
Memory: G.Skill - Ripjaws V Series 8GB (2 x 4GB) DDR4-3200 Memory ($90.99 @ Newegg)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($40.99 @ Best Buy)
Video Card: Gigabyte - GeForce GTX 1050 Ti 4GB Video Card ($146.99 @ SuperBiiz)
Case: Zalman - T2 Plus MicroATX Mini Tower Case ($33.98 @ Newegg)
Power Supply: Corsair - CXM 550W 80+ Bronze Certified Semi-Modular ATX Power Supply ($34.99 @ Newegg)
Total: $498.79
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-10-23 19:59 EDT-0400
 
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photonboy

photonboy

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I don't understand the PURCHASE part.

You said you already BOUGHT the memory, so why do you have two builds with different DDR4 memory?

(If you've got a DDR4 2800MHz kit just keep it for whatever build you do)

*I would also stick with RYZEN. The AM4 socket should hang around, so you likely would have an upgrade path to a CPU like THIS which may be out in 2019 (ish) thus may purchase then or 2020, 2021...

ZEN2 8C/16T (8-core/16-thread) with possibly 20% higher performance than R7-1800X

(possibly 3-4x more powerful in full thread usage than R3-1200)

And of course replacing the MOTHERBOARD if it fails in a few years will be far harder with the Intel choice once they stop making it.
 
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Rubiksgocraft

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Those 2 builds aren't mine, those were suggested to me by vapour. I am looking into them for feasibility.
 
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rob.salewytsch

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I support this option.

As far as your question about RAM, (the way I understand it,) the worst case scenario if the RAM isn't "compatible" is that it will just run at the base speed instead of the 2800 (which is considered an OC speed). So check the RAM you have against the QVL (Qualified Vendor List) on the motherboard manufacturer's website. If necessary, look for a different motherboard. (I doubt that Vapour did this for you when he selected the motherboard as he selected a different type of RAM than you have).

HOWEVER, if the budget can be squeezed a bit more, and the Ryzen 5 1600 is $195ish and will perform better and last longer. If the budget can't be squeezed then the R3 mentioned above is about your best bet.
 
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