There are 2 people on GMATClub.com who gave their GMAT in 2010:

jauer112 - 770 (Q50 V46) - gave GMAT on 23 Nov 2010. http://gmatclub.com/forum/770-q50-v46-105245.html
Eok - 770 (Q50 V44) - gave GMAT on 19 Jun 2010. http://gmatclub.com/forum/770-q50-v44-96062.html
Firstly, HOW is this possible?

And secondly, does a Q51 affect your score more than a V47?!
_________________

Read about my GMAT prep at http://gmatting.blogspot.com/
1st Feb '11 -- Actual GMAT : 730 (Q48 V42) AWA 6.0

My Practice GMAT Scores
29th Jan '11 -- GMATPrep#2 : 700 (Q47 V38)
23rd Jan '11 -- MGMAT Practice Test #3 : 670 (Q45 V36)
19th Jan '11 -- GMATPrep#1 v.1 : 710 (Q49 V37)
15th Jan '11 -- GMATPrep#1 : 720 (Q47 V42)
11th Jan '11 -- MGMAT Practice Test #2 : 740 (Q47 V44)
6th Jan '11 -- Kaplan#2 : 620 (Q40 V35)
28th Dec '10 -- PowerPrep#1 : 670 (Q47 V35)
30th Oct '10 -- MGMAT Practice Test #1 : 660 (Q45 V35)
12th Sept '10 -- Kaplan Free Test : 610 (Q39 V37)
6th Dec '09 -- PR CAT #1 : 650 (Q44 V37)
25th Oct '09 -- GMATPrep#1 : 620 (Q44 V34)

If you feel like you're under control, you're just not going fast enough.
A goal without a plan is just a wish.
You can go higher, you can go deeper, there are no boundaries above or beneath you.

Hmmm...!

So is a Q51 necessary to cross 770 even if you're scoring between 44-48 in Verbal?
_________________

Read about my GMAT prep at http://gmatting.blogspot.com/
1st Feb '11 -- Actual GMAT : 730 (Q48 V42) AWA 6.0

My Practice GMAT Scores
29th Jan '11 -- GMATPrep#2 : 700 (Q47 V38)
23rd Jan '11 -- MGMAT Practice Test #3 : 670 (Q45 V36)
19th Jan '11 -- GMATPrep#1 v.1 : 710 (Q49 V37)
15th Jan '11 -- GMATPrep#1 : 720 (Q47 V42)
11th Jan '11 -- MGMAT Practice Test #2 : 740 (Q47 V44)
6th Jan '11 -- Kaplan#2 : 620 (Q40 V35)
28th Dec '10 -- PowerPrep#1 : 670 (Q47 V35)
30th Oct '10 -- MGMAT Practice Test #1 : 660 (Q45 V35)
12th Sept '10 -- Kaplan Free Test : 610 (Q39 V37)
6th Dec '09 -- PR CAT #1 : 650 (Q44 V37)
25th Oct '09 -- GMATPrep#1 : 620 (Q44 V34)

If you feel like you're under control, you're just not going fast enough.
A goal without a plan is just a wish.
You can go higher, you can go deeper, there are no boundaries above or beneath you.

I agree with Whiplash, your scaled score most likely falls in a range. In case of jauer112 his/her scaled verbal score was probably between 43.5 and 44.5. Since some users with Q50 and V44 got a score of 760 it is likely that it was closer to 44.5 than to 43.5.

If you want to find out the minimum / maximum scaled Q and V score that yields a given GMAT score (or vice versa) I'd just google this. To answer your other question, I googled "Q50, V48, 780" and found that there are some people who got 780 with this combination, so it seems you don't have to score Q51 to get more than 770 (given a verbal score of 48+).

At the end of the day I think that's all irrelevant. Just do your best at the test and see what score pops up.

I think when you're at a Quant 49 or so, there really is nothing you can do to get it up to a 51. It's all dependent on that time and your mindset. Make sure you don't make careless mistakes and do the GMAT Club tests to go through some common traps you might encounter and you should be okay.

I would focus on the Verbal if I were you!