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Question 57

A technician upgraded the memory on a server from two 8GB sticks to eight 32GB sticks. The server memory is now at full capacity per the user guide. When the technician powers on the system, only 128GB of memory is recognized by the OS and the BIOS. The technician decides to upgrade to the latest version of the firmware on the system, which does not help. Next, the technician installs the memory in sets of 64GB at a time. Each individual set of 64GB is fully recognized by the server.

Which of the following will not allow the server to recognize all of the memory installed at the same time?

    Correct Answer: A

    The server recognizes only 128GB of memory instead of the full 256GB. The memory modules work individually and in sets, but the full set isn't recognized simultaneously. This points to an issue affecting the system's ability to handle the increased amount of memory when all modules are installed together. One potential cause is insufficient power supply. Upgrading from two 8GB sticks to eight 32GB sticks significantly increases power demand. If the power supply cannot provide enough power to support all the installed memory, it will limit the amount of memory that can be effectively powered and recognized. Thus, the inadequate power supply is preventing the server from recognizing all of the installed memory at the same time.

Discussion
156748918635135Option: A

I believe the answer should be A, the power supply is not providing enough power. This is a crap comptia question. Testing the Power consumption of a system by varying the number of DDR 4 RAM Modules 16x 8GB - 232W 4x 8GB - 205W Savings: 27W https://www.servethehome.com/ddr4-dimms-system-power-consumption-tested/ - DDR3 RAM uses a 240-pin connector, while DDR4 RAM uses a 288-pin connector. - The standard voltage of DDR3 RAM sits at 1.5V, while DDR3L RAM can use both 1.35V and 1.5V. DDR4 RAM, on the other hand, uses 1.2V. Low Standard Performance DDR3 1.35 V 1.50 V 1.65 V DDR4 1.05 V 1.20 V 1.35 V - You cannot install a DDR4 RAM onto a DDR3 port or vice versa! - While speaking in general terms, and motherboard built between the years 2007 and 2014 is likely to support DDR3 RAM, while models made after 2014 are more likely to support the DDR4 module https://beebom.com/ddr3-vs-ddr4-ram/

poorguyacOption: D

You can't put 2 type of mem stick in the system. since they are difference pin DDR3 stick can't physically fit into a DDR4 slot and vice versa so D is an incorrect answer

Frood44

Not really related to this specific question, but just so you know: there are motherboards out there that can support DDR3 ánd DDR4 (not at the same time though). See ASRock B150M Combo G

pedronery

this questions and answer doesn't make ANY sense!!!

Some_Random_NerdOption: A

This question clearly states a number of things that you need to consider. 1: The user guide for the machine says it CAN support 8 32gb sticks. 2: ALL of the memory modules ARE working, but only half of them are detected when they are all installed together. 3: With all the ram installed, the system boots fine, but the BIOS does not detect the added ram. -From these facts we MUST rule out D as a valid option. -No statement in the question implies that the system will not run, or is locking up, so option C is also not valid. -ECC errors happen as the memory is used, and would not prevent it from being detected in the BIOS, so option B is not valid. -Too much power draw would prevent the system from booting, or it would lock it up. It can not selectively choose Not to power a few sticks of ram if the power supply was inadequate. As such we must assume that this question was recorded and published incorrectly.

EBraidOption: A

MeasureUp has this exact question and answers listed, but lists POWER as the correct answer

mlamp

Exam4Training also has POWER as the correct answer

HotbutteredbiscuitOption: D

I think we all agree D is totally wrong, but what is Comptia looking for on the exam?

MADRAOption: D

Correct Answer is D. just know that DDR3 supports 128gb max memory and that the Server NEEDS DDR4 not that it HAS or can support DDR4.

Cesar_811Option: B

DDR3 & DDR4 memory needs to be installed? The question says the tech upgraded from 2 8Gbp to 8 32Gbp sticks and doesn't mention what kind of memory he or she used. So why would I assume that the tech is using ECC memory? Or, any otherwise?

djc76Option: D

I think you’re all reading it wrong it doesn’t say anything about sharing DDR3 and DDR4 in answer D. It says the server needs DDR4 and DDR3 is installed , meaning you need to replace DDR3 with DRR4

Cesar_811

OOOOHHHH YES! I posted a comment before reading yours and you're right 100%! DDR3 is installed and instead, DDR4 should be. Thanks...djc76

user54321

Nowhere in the question does it state that you installed DDR3 RAM, it does however state that you tried the sticks 2 at a time and they all worked, which wouldn't be possible if it were DDR3. This also rules out too many ECC errors as we've confirmed that all 8 sticks are working. It's very unlikely to be overheating because why would the PC stop using RAM sticks if it was overheating? it would just reboot. That leaves not enough power, seems like an unusual symptom of not having enough power but i guess if it's the newest component added the machine could just decide it can't handle it and never bother powering it up during boot. Just a guess. Another badly phrased question but i'd say that's the answer that makes most sense from the ones given

Mastro_Grim

The guy was able to mount every single stick of 32 RAM. So wether the server is ddr4 or ddr3 is meaningless, we know that can't be the problem for the single fact that they guy was able to physically mount the sticks

WinglessOption: D

So um.... After re-reading.... and re-re-reading the question. The only answer that make sense is D. As the question asks "Which of the following will "-> not <-" allow the server to recognize all of the memory installed at the same time?" The question is horrible and they seem to want you to miss that word, which is why so many people can't agree on the answer as the other 3 could help.

Ducnam8888Option: D

Can I use DDR3 and DDR4 RAMS together? First of all, DDR3 and DDR4 are physically different, so if DDR3 fits in your motherboard, DDR4 won’t, and vice versa. The short answer here is no, you cannot do that. Even if you somehow manage to install both types of RAM, your processor will only support one of them, and the other will either cause you to not be able to boot, or it would just sit there and do nothing(most likely the first). https://www.quora.com/Can-I-use-DDR3-and-DDR4-RAMS-together#:~:text=No%2C%20you%20can't.,as%20they%20have%20different%20pins.

polygonman244Option: A

CompTIA is completely wrong, the answer is A. Not only does DDR3 have completely different number of pins, you cant fit DDR3 into DDR4 slots and vice versa. I would think the people who make the questions should know this. I mean they have actual IT technicians making the questions right?

user54321

You know CompTIA doesn't supply the answers here right? These are dunmped questions that have answers supplied by this site's admins/the commnity.

ilovemen69Option: A

I might be in the wrong but i dont think its A since powering ram does not require much power, so if we push that idea to the side for a bit, I looked up some server motherboards that support DDR3 only rams and saw in the specification list that it: Up to 128GB DDR3 ECC/non-ECC UDIMM. https://www.supermicro.com/products/motherboard/Xeon/C600/X9DRH-7F.cfm In addition, DDR4 server motherboards are able to handle 1TB of RAM. Honestly, still conflicted between the two answers but this was one of my thought process when doing this question

SixGoddessOption: A

the answer is A upgrading from two 8 gb sticks to eight 32gb sticks significantly increases the power demand.

SDCACROption: A

How can you mix DDR3 and DDR4 memories in one motherboard?

trungHOption: A

I believe the answer is A. This was on one of the practice exam dumps we had but the wording was a bit different but basically 256GB of memory if all 4 sticks were able to be read but only half 128GB is being seen so power to the rest of the RAMs must be the issue as I don't see what DDR4 and DDR3 have to do with the server not being able to pick up all 256GB

jpushOption: B

B seems to be the only answer that makes sense. TIHNK WELL AND READ UP ON ECC